Gitea Actions runner for docker-1 (deploy/runner), DEPLOY.md and PLAN.md notes

Co-Authored-By: Claude Fable 5.1 <[email protected]>

deploy/runner/config.yaml

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+# act_runner configuration for the docker-1 runner. Every value not set here keeps the runner's default.
+# Reference: https://gitea.com/gitea/act_runner/src/branch/main/internal/pkg/config/config.example.yaml
+
+log:
+  level: info
+  job:
+    dir: /data/logs       # a copy of each job log, kept a week
+    retention: 168h
+
+runner:
+  file: /data/.runner
+  capacity: 2             # server and frontend jobs run side by side; the e2e job is heavy on its own
+  timeout: 1h
+  labels:
+    - "ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest"
+
+cache:
+  enabled: true
+  dir: /data/cache
+
+container:
+  # The job workspace is a Docker volume; the Docker proxy maps workspace paths for sibling
+  # containers, so `docker compose` in the e2e job can bind-mount tests/e2e and deploy/postgres/initdb.
+  privileged: false
+  valid_volumes: []
+  # The proxy removes what a job started (the CI compose stack included) when the job ends.
+  sweep: true