feat(docker): add automatic container entrypoint seeding script

docker-compose.yml

@@ -1,23 +1,25 @@
 version: '3.8'
 
 services:
-  kunden_app:
-    build:
-      context: .
-      dockerfile: Dockerfile
+  app:
     image: nd-waas-engine:latest
-    container_name: kunden_instanz_app
+    container_name: waas_${CUSTOMER_SLUG:-kunden_app}
     restart: always
     environment:
       - NODE_ENV=production
       - PORT=3000
       - DATA_DIR=/app/data
     volumes:
-      # Kunden-Konfigurationsdaten & Uploads bleiben bei Updates persistent
+      # Hier werden site.config.json, sqlite.db, uploads etc. automatisch vom Container angelegt
       - ./data:/app/data
     ports:
-      # Interne Port-Anbindung für den händischen Nginx Reverse Proxy
-      - "127.0.0.1:8080:3000"
+      # Anbindung an deinen händischen Nginx Reverse Proxy auf dem Host
+      - "127.0.0.1:${PORT:-8080}:3000"
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "http://localhost:3000/api/health"]
+      interval: 10s
+      timeout: 3s
+      retries: 3
     logging:
       driver: "json-file"
       options: