Add CI using GH Actions

[progval]

I hoped to test for older OTP versions with:

          - otp: '21'
            elixir: '1.11'
            os: 'ubuntu-20.04'
          - otp: '22'
            elixir: '1.13'
            os: 'ubuntu-20.04'

(with Ubuntu 20.04 instead of 22.04, because of https://github.com/erlef/setup-beam#compatibility-between-operating-system-and-erlangotp )

Unfortunately, they fail with:

Generated thurim app
** (Mix) Could not start application thurim: Thurim.Application.start(:normal, []) returned an error: shutdown: failed to start child: Thurim.Federation.KeyServer
    ** (EXIT) an exception was raised:
        ** (FunctionClauseError) no function clause matching in :crypto.generate_key/3
            (crypto 4.4.2.3) crypto.erl:1037: :crypto.generate_key(:eddsa, :ed25519, :undefined)
Warning:             (thurim 0.1.0) lib/thurim/federation/key_server.ex:11: Thurim.Federation.KeyServer.init/1
            (stdlib 3.8.2.4) gen_server.erl:374: :gen_server.init_it/2
Warning:             (stdlib 3.8.2.4) gen_server.erl:342: :gen_server.init_it/6
            (stdlib 3.8.2.4) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

My guess is this is caused by the openssl version in ubuntu 20.04, but I didn't look into it.

Tests are flaky, occasionally failing with these errors I don't really understand:

  1) test register/available returns false when the username is not available (ThurimWeb.UserControllerTest)
     test/thurim_web/controllers/user_controller_test.exs:47
     ** (ArgumentError) errors were found at the given arguments:
     
       * 1st argument: the table identifier does not refer to an existing ETS table
     
     code: create_user(conn, username, password)
     stacktrace:
       (stdlib 4.2) :ets.lookup(ThurimWeb.Endpoint, :render_errors)
       (thurim 0.1.0) lib/phoenix/endpoint.ex:515: ThurimWeb.Endpoint.config/2
       (thurim 0.1.0) lib/thurim_web/endpoint.ex:1: ThurimWeb.Endpoint.call/2
       (phoenix 1.6.8) lib/phoenix/test/conn_test.ex:225: Phoenix.ConnTest.dispatch/5
       test/thurim_web/controllers/user_controller_test.exs:2: ThurimWeb.UserControllerTest.create_user/3
       test/thurim_web/controllers/user_controller_test.exs:50: (test)



  2) test account/password succeeds when authenticated, logging out of all other devices (ThurimWeb.UserControllerTest)
     test/thurim_web/controllers/user_controller_test.exs:102
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/user_controller_test.exs:1: ThurimWeb.UserControllerTest.__ex_unit__/2



  3) test registration with username and password provided (ThurimWeb.UserControllerTest)
     test/thurim_web/controllers/user_controller_test.exs:399
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/user_controller_test.exs:1: ThurimWeb.UserControllerTest.__ex_unit__/2



  4) test PUT /presence/{user_id}/status updates Presence with params (ThurimWeb.PresenceControllerTest)
     test/thurim_web/controllers/presence_controller_test.exs:37
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/presence_controller_test.exs:1: ThurimWeb.PresenceControllerTest.__ex_unit__/2



  5) test PUT /presence/{user_id}/status can only update logged in user's presence (ThurimWeb.PresenceControllerTest)
     test/thurim_web/controllers/presence_controller_test.exs:26
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/presence_controller_test.exs:1: ThurimWeb.PresenceControllerTest.__ex_unit__/2



  6) test PUT /presence/{user_id}/status it returns a 200 response (ThurimWeb.PresenceControllerTest)
     test/thurim_web/controllers/presence_controller_test.exs:15
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/presence_controller_test.exs:1: ThurimWeb.PresenceControllerTest.__ex_unit__/2



  7) test GET /presence/:user_id/status returns user presence when found (ThurimWeb.PresenceControllerTest)
     test/thurim_web/controllers/presence_controller_test.exs:68
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/presence_controller_test.exs:1: ThurimWeb.PresenceControllerTest.__ex_unit__/2



  8) test GET /presence/:user_id/status returns M_NOT_FOUND when presence has not been established (ThurimWeb.PresenceControllerTest)
     test/thurim_web/controllers/presence_controller_test.exs:58
     ** (MatchError) no match of right hand side value: {:error, {%RuntimeError{message: "could not lookup Ecto repo Thurim.Repo because it was not started or it does not exist"}, [{Ecto.Repo.Registry, :lookup, 1, [file: 'lib/ecto/repo/registry.ex', line: 22, error_info: %{module: Exception}]}, {Ecto.Adapters.SQL.Sandbox, :lookup_meta!, 1, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 571]}, {Ecto.Adapters.SQL.Sandbox, :checkout, 2, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 484]}, {Ecto.Adapters.SQL.Sandbox, :"-start_owner!/2-fun-0-", 3, [file: 'lib/ecto/adapters/sql/sandbox.ex', line: 406]}, {Agent.Server, :init, 1, [file: 'lib/agent/server.ex', line: 8]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 851]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 814]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 240]}]}}
     stacktrace:
       (ecto_sql 3.8.1) lib/ecto/adapters/sql/sandbox.ex:403: Ecto.Adapters.SQL.Sandbox.start_owner!/2
       (thurim 0.1.0) test/support/data_case.ex:39: Thurim.DataCase.setup_sandbox/1
       (thurim 0.1.0) test/support/conn_case.ex:67: ThurimWeb.ConnCase.__ex_unit_setup_0/1
       (thurim 0.1.0) test/support/conn_case.ex:1: ThurimWeb.ConnCase.__ex_unit__/2
       test/thurim_web/controllers/presence_controller_test.exs:1: ThurimWeb.PresenceControllerTest.__ex_unit__/2

On both GH Actions and my own computer, though it's rarer on my computer.

[serra-allgood]

CI is something I'd like to get to, but I've been bad about writing actual tests, so I'm not too concerned with CI yet. I appreciate you looking into it though!