fix(docker): Change server host port mapping to 8080 to avoid runner conflict

docker-compose.yml

@@ -6,7 +6,7 @@ services:
     container_name: meldestelle-server
     restart: unless-stopped
     ports:
-      - "8081:8080"
+      - "8080:8080"
     environment:
       - DB_USER=${POSTGRES_USER}
       - DB_PASSWORD=${POSTGRES_PASSWORD}