CHANGE: added env file, checking docker postgres initdb

Docker/docker-compose.yml

@@ -6,12 +6,13 @@ services:
     env_file:
       - .env
     environment:
-      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_USER: ${POSTGRES_ADMIN}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
       POSTGRES_DB: ${POSTGRES_DB}
       PGDATA: /var/lib/postgresql/data/pg_data
     volumes:
       - ${POSTGRES_PATH}:/var/lib/postgresql/data
+      - ${POSTGRES_PATH}/initdb:/docker-entrypoint-initdb.d
 
   backend:
     image: git.letsstein.de/tom/arbeitszeit-backend