Dockerfile and Docker compose

config/database.yml.docker

@@ -0,0 +1,19 @@
+default: &default
+  adapter: postgresql
+  pool: 16
+  username: <%= ENV['POSTGRES_USER'] %>
+  password: <%= ENV['POSTGRES_PASSWORD'] %>
+  host: db
+
+development:
+  <<: *default
+  database: codeocean_development
+
+production:
+  <<: *default
+  database: codeocean_production
+
+test:
+  <<: *default
+  database: codeocean_test
+