ci: Workflow für node:20-bookworm-Runner, Runner-Stack im Swarm-Muster des bestehenden gitrunner

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/gitea-runner/config.yaml

@@ -1,19 +1,20 @@
+# act_runner-Konfiguration für cluster-knaster (Swarm-Config gitrunner_knaster_config_v1)
 log:
   level: info
 runner:
   file: /data/.runner
   capacity: 1                 # nur ein Job gleichzeitig
   timeout: 30m
+  fetch_timeout: 5s
   fetch_interval: 5s
-  labels:
-    - "ubuntu-latest:docker://catthehacker/ubuntu:act-22.04"
 cache:
   enabled: true
   dir: /data/cache
 container:
+  network: bridge             # wie der Org-Runner: kein eigenes Netz pro Job (Swarm-Adresspools)
   privileged: false
   options: "--cpus=1 --memory=2g"   # Grenze pro Job-Container
-  valid_volumes: []
+  docker_host: ""
   force_pull: false
 host:
   workdir_parent: /data/workdir