feat: add Kubernetes backend (#1260)

nprasad2077/runner

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Adds a Kubernetes backend. A `name:kubernetes://image` label runs the job as one pod through the Kubernetes API, with services as containers of the same pod. Step env is exported by a script sent over exec stdin, keeping it out of the pod spec and process arguments, and service env goes into a per-job Secret. Docker actions and container options are rejected. See `docs/kubernetes.md`.

Operators shape job pods with `kubernetes.pod_template`, with per-label `pod_templates` merged in `runs-on` order and a `$services` entry for service containers. The idle cleanup removes pods and Secrets a runner left behind.

The client calls the Kubernetes API directly and runs step commands over `coder/websocket` (same dependency used in gitea) instead of pulling in the heavyweight `kubernetes/client-go`. Includes an e2e test against k3s.

Replaces: https://gitea.com/gitea/runner/pulls/1000
Fixes: https://gitea.com/gitea/runner/issues/31

Assisted-by: Claude Code:claude-opus-5-5
Co-authored-by: Zettat123 <[email protected]>
Co-authored-by: bircni <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1260
Reviewed-by: Lunny Xiao <[email protected]>
Reviewed-by: Zettat123 <[email protected]>
Co-authored-by: silverwind <[email protected]>

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Lunny Xiao committed 2026-10-01 06:59:15 +00:00

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				@@ -10,6 +10,7 @@ require (

					gitea.dev/actionslib v1.2.1

					github.com/avast/retry-go/v5 v5.0.0

					github.com/bmatcuk/doublestar/v4 v4.10.2

					github.com/coder/websocket v1.8.15

					github.com/containerd/errdefs v1.0.0

					github.com/creack/pty v1.1.24

					github.com/distribution/reference v0.6.0