Remove PostgreSQL and move to SQLite3

docker-compose.yml

@@ -1,30 +1,13 @@
 services:
-  db:
-    image: postgres:16
-    environment:
-      POSTGRES_DB: ${POSTGRES_DB}
-      POSTGRES_USER: ${POSTGRES_USER}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
-    volumes:
-      - pgdata:/var/lib/postgresql/data
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
-      interval: 5s
-      timeout: 5s
-      retries: 20
-
   backend:
     build: ./backend
     environment:
-      DATABASE_URL: postgresql+psycopg://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
+      DATABASE_URL: sqlite:////app/data/cluedo.db
       SECRET_KEY: ${BACKEND_SECRET_KEY}
-      ADMIN_EMAIL: ${ADMIN_EMAIL}
-      ADMIN_PASSWORD: ${ADMIN_PASSWORD}
       COOKIE_SECURE: "false"   # intern ohne https; wenn du später https machst -> true
       COOKIE_SAMESITE: "Lax"
-    depends_on:
-      db:
-        condition: service_healthy
+    volumes:
+      - cluedo-data:/app/data
     ports:
       - "8080:8080"
 
@@ -36,4 +19,4 @@ services:
       - "8081:80"
 
 volumes:
-  pgdata:
+  cluedo-data: