Allow configuring Postgres through env variables while using Compose

Author: janklan

docker-compose.yml

@@ -1,12 +1,12 @@
 services:
   postgres:
-    image: postgres:17
+    image: postgres:${POSTGRES_VERSION:-17}
     environment:
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: postgres
-      POSTGRES_DB: postgres_doctrine_test
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
+      POSTGRES_DB: ${POSTGRES_DB:-postgres_doctrine_test}
     ports:
-      - "5432:5432"
+      - "${POSTGRES_PORT:-5432}:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
     healthcheck: