forgejo-runner(host): configure forgejo-runner setup

resources/chaosknoten/forgejo-runner/forgejo-runner/configuration.yaml.j2

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+log:
+  level: info
+  job_level: info
+
+runner:
+  file: .runner
+  capacity: 4
+  timeout: 1h
+  shutdown_timeout: 30m
+  insecure: false
+  fetch_timeout: 30s
+  fetch_interval: 2s
+  report_interval: 1s
+  labels:
+    # https://forgejo.org/docs/latest/admin/actions/configuration/#choosing-labels
+    - docker:docker://docker.io/library/node:lts
+
+cache:
+  enabled: false
+
+container:
+  # Leave emtpy to create a network automatically.
+  network: ""
+  enable_ipv6: true
+  privileged: false
+  ## Something like this once gVisor can be used.
+  ## options: "--runtime=runsc --mount type=bind,src=/etc/gvisor-helper-resolv.conf,dst=/etc/resolv.conf,ro=true"
+  # Leave empty for default /workspace to be used.
+  workdir_parent:
+  ## Something like this once gVisor can be used.
+  ## Add /etc/gvisor-helper-resolv.conf to valid_volumes to make the bind-mount in options work.
+  ## valid_volumes: ["/etc/gvisor-helper-resolv.conf:ro"]
+  # Leave "-", so no docker host will be mounted in the job container.
+  docker_host: "-"
+  force_pull: true
+  force_rebuild: false
+
+server:
+  connections:
+    ccchh-git:
+      url: https://git.hamburg.ccc.de/
+      uuid: c672834d-3d63-4471-894e-80f6888eb4de
+      token: {{ secret__forgejo_runner_ccchh_git_token }}