Update README.md and fix setup to work with or without docker

Dockerfile

@@ -14,8 +14,6 @@ ENV BUNDLE_JOBS 8
 ENV APP_HOME /myapp
 
 ARG RAILS_ENV=production
-ENV RAILS_ENV=$RAILS_ENV
-ENV RACK_ENV=$RAILS_ENV
 
 COPY . $APP_HOME
 WORKDIR $APP_HOME

README.md

@@ -4,6 +4,8 @@ Keeps track of membership to a society.
 
 ## Getting started
 
+(Docker version follows).
+
 ### Prerequisites
 
 * Ruby (See `.ruby-version` for the version you have to install)
@@ -12,7 +14,13 @@ Keeps track of membership to a society.
 
 ### Set-up
 
-Clone this repository and run the following from the working directory:
+Install dependencies, copy `config/database.yml.sample` to `config/database.yml`:
+
+    cp config/database.yml.sample config/database.yml
+
+Edit `config/database.yml` according to your setup.
+
+Then run:
 
     bin/setup
     yarn install
@@ -31,14 +39,39 @@ And
 
     yarn build --watch
 
-## Testing
-
-This codebase started out without tests. Some are being introduced over time.
-
 To run tests:
 
     bundle exec rspec
 
+## Getting started (using docker)
+
+Install [docker](https://docs.docker.com/engine/install/) and
+[docker compose](https://docs.docker.com/compose/install/).
+
+Copy files:
+
+    cp docker-compose.yml.sample docker-compose.yml
+    cp config/database.yml.docker config/database.yml
+
+Edit them according to your setup and preferences.
+
+NOTE: leave `RAILS_ENV: test` or change it to `RAILS_ENV: development` in
+`docker-compose.yml`. Either value does the same.
+
+Then run:
+
+    docker compose pull
+    docker compose build
+    docker compose run --rm app ./bin/setup
+
+To start:
+
+    docker compose up app assets
+
+To run the tests:
+
+    docker compose run --rm app bundle exec rspec
+
 ## Voting
 
 Voting can be enabled by setting a `VOTE_URL_TEMPLATE` environment variable.

bin/setup

@@ -17,11 +17,6 @@ FileUtils.chdir APP_ROOT do
   system! "gem install bundler --conservative"
   system("bundle check") || system!("bundle install")
 
-  puts "\n== Copying sample files =="
-  unless File.exist?("config/database.yml")
-    FileUtils.cp "config/database.yml.sample", "config/database.yml"
-  end
-
   puts "\n== Preparing database =="
   system! "bin/rails db:prepare"
 

docker-compose.yml.sample

@@ -10,7 +10,7 @@ services:
     expose:
       - "5432"
 
-  app:
+  assets: &ruby
     build:
       context: .
       args:
@@ -23,6 +23,10 @@ services:
       - AUTH_NAME=secretary
       - AUTH_PASSWORD=password
     working_dir: /app
+    command: yarn build --watch
+
+  app:
+    <<: *ruby
     command: bundle exec falcon serve -n 2 -b 'http://0.0.0.0:3000'
     ports:
       - "3000:3000"