test: allow changing verbosity in captured logs (#575)

This is useful in some development sessions, as by default the printed
logs can be quite lengthy, especially in integration tests. This change
adds support for using `TEST_LOGS` environment variable to set the
captured verbosity to values that make it easier to debug the output.

Author: hauleth

VERSION

@@ -1 +1 @@
-2.1.7
+2.1.8

config/test.exs

@@ -48,7 +48,7 @@ config :supavisor, Supavisor.Vault,
 
 # Print only warnings and errors during test
 config :logger, :console,
-  level: :error,
+  level: :none,
   metadata: [:error_code, :file, :line, :pid, :project, :user, :mode]
 
 # Initialize plugs at runtime for faster test compilation