Tidy docker setup

Author: michael-misshore

docker-compose.yml

@@ -8,22 +8,13 @@ services:
             - .:/app:rw
         volumes_from:
             - data
-        depends_on:
-            - postgres
         env_file: docker/ruby/.env
         container_name: criticalpathcss_ruby
 
-    postgres:
-        image: postgres:10.1
-        ports:
-            - 5432:5432
-        volumes_from:
-            - data
-        env_file: ./docker/postgres/config
-
     data:
-        image: postgres:10.1
+        build:
+            context: .
+            dockerfile: docker/ruby/Dockerfile
         volumes:
-            - /var/lib/postgresql/data
             - /gems
         command: "true"

docker/postgres/config

@@ -1,6 +1 @@
 RAILS_ENV=development
-DATABASE_HOST=postgres
-DATABASE_NAME=critical_path_css_development
-DATABASE_USERNAME=docker
-DATABASE_PASSWORD=docker
-DATABASE_TEST_NAME=critical_path_css_test