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enhance(config): expand environment values (#1274)

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Config values can reference the runner's environment as `${NAME}`, for example `capacity: ${RUNNER_CAPACITY}`, so container deployments can configure the runner without templating the file. An unset `NAME` fails the load instead of silently becoming empty, and `$${NAME}` writes a literal `${NAME}`. Keys are never expanded.

Breaking: an existing value containing `${NAME}`, such as a shell command in a Kubernetes `pod_template`, now needs `$${NAME}`.

Closes https://gitea.com/gitea/runner/issues/551
Co-authored-by: silverwind <[email protected]>
Co-authored-by: silverwind <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1274
Reviewed-by: silverwind <[email protected]>
Co-authored-by: bircni <[email protected]>
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bircnisilverwindsilverwind
 authored and silverwind committed 2026-10-08 17:31:00 +00:00
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docs/kubernetes.md
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@@ -45,7 +45,7 @@ kubernetes:
nvidia.com/gpu.present: "true"
```
A job with `runs-on: [linux, gpu]` gets the `linux` and then the `gpu` entry of `pod_templates` merged over `pod_template`, while its image comes from the first of its labels the runner has. A template volume named `workspace` or `act` replaces the `emptyDir` the runner mounts at the workspace or at `/var/run/act`, for example to limit its size. Images are pulled by the cluster's `imagePullPolicy` default, a template's, or always with `container.force_pull`.
A job with `runs-on: [linux, gpu]` gets the `linux` and then the `gpu` entry of `pod_templates` merged over `pod_template`, while its image comes from the first of its labels the runner has. A template volume named `workspace` or `act` replaces the `emptyDir` the runner mounts at the workspace or at `/var/run/act`, for example to limit its size. Images are pulled by the cluster's `imagePullPolicy` default, a template's, or always with `container.force_pull`. Like every config value, templates expand `${NAME}` from the runner's environment, so a shell command in a template writes `$${NAME}` for the pod's own variable.
Job pods mount no service account token unless the template sets `automountServiceAccountToken: true`. Job pods and their Secrets are labeled `app.kubernetes.io/managed-by: gitea-runner` and `com.gitea.runner.uuid: <runner UUID>`. The idle cleanup removes those the runner did not get to remove, once they are older than `runner.workdir_cleanup_age`.