fix: Robust PostgreSQL healthcheck and remove makemigrations on container startup for Coolify deployments

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 # Coolify & Production Ready Docker Compose Configuration
 # Traefik in Coolify automatically routes traffic to the 'frontend' service on port 80 via expose.
 # Host port bindings (ports) are omitted to avoid host port 80 conflicts with Traefik.
@@ -17,18 +15,17 @@ services:
       - "5432"
     restart: unless-stopped
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-shiftplan_user} -d ${POSTGRES_DB:-shiftplan_db}"]
-      interval: 5s
-      timeout: 5s
-      retries: 5
+      test: ["CMD-SHELL", "pg_isready"]
+      interval: 3s
+      timeout: 3s
+      retries: 10
 
   backend:
     build:
       context: ./backend
       dockerfile: Dockerfile
     command: >
-      sh -c "python manage.py makemigrations --noinput &&
-             python manage.py migrate --noinput &&
+      sh -c "python manage.py migrate --noinput &&
              python manage.py collectstatic --noinput &&
              python manage.py create_admin &&
              gunicorn --bind 0.0.0.0:8000 --workers 3 shiftplan_backend.wsgi:application"