chore: simplify docker-only deployment workflow

docker-compose.yml

@@ -1,3 +1,10 @@
+networks:
+  internal:
+    external: false
+  proxy:
+    name: proxy
+    external: true
+
 services:
   pdf-to-ics-web:
     build: .
@@ -5,8 +12,17 @@ services:
     restart: unless-stopped
     ports:
       - "8000:8000"
+    networks:
+      - internal
+      - proxy
     environment:
       - TZ=Europe/Berlin
       # Optional aktivieren für App-Login:
-      # - WEB_AUTH_USER=kalender
-      # - WEB_AUTH_PASSWORD=BitteSicheresPasswortSetzen
+      - WEB_AUTH_USER=dbregio
+      - WEB_AUTH_PASSWORD=dbregio
+    healthcheck:
+      test: ["CMD", "python3", "-c", "import http.client,sys;c=http.client.HTTPConnection('127.0.0.1',8000,timeout=5);c.request('GET','/');r=c.getresponse();sys.exit(0 if r.status in (200,401) else 1)"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s