feat: add db init on prod, and remove former image attributes from docker-compose

docker-compose.dev.yml

@@ -5,7 +5,6 @@ services:
     build:
       context: ./PostgreSQL
       dockerfile: Dockerfile
-    image: postgres
     restart: always
     environment:
       - POSTGRES_DB=${DB_NAME}

docker-compose.prod.yml

@@ -2,7 +2,9 @@ services:
   database:
     hostname: database
     container_name: briques_postgres
-    image: postgres
+    build:
+      context: ./PostgreSQL
+      dockerfile: Dockerfile
     restart: always
     environment:
       - POSTGRES_DB=${DB_NAME}