chore: use project-specific environment variables...

- For now, the email fields are commented out. Not sure how best to handle case where environment variable is not present. Two possible solutions:
  1. Optimal solution - If environment variable is not present, see if returning a YAML boolean will prevent the env var from being set in the container
  2. Less-optimal solution - In Elixir code, cast empty string value to nil

support/containers/compose.phoenix.yaml

@@ -12,10 +12,8 @@ services:
       # db
       DATABASE_URL: "${DATABASE_URL:?}"
 
-      # email
-      AWS_REGION: "${AWS_REGION:?}"
-      AWS_ACCESS_KEY: "${AWS_ACCESS_KEY:?}"
-      AWS_SECRET: "${AWS_SECRET:?}"
-
-      # sentry
-      SENTRY_DSN: "${SENTRY_DSN:?}"
+      # # email
+      # AWS_REGION: "${AWS_REGION}"
+      # AWS_ACCESS_KEY: "${AWS_ACCESS_KEY}"
+      # AWS_SECRET: "${AWS_SECRET}"
+      # EMAIL_RECIPIENT_CONTACT_FORM: "${EMAIL_RECIPIENT_CONTACT_FORM}"