fix: bump actions-runner to 2.336.0 - #20
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GitHub rejects job messages from runner versions that fall out of the support window, and ARC disables runner self-update, so a pinned base image silently breaks every runner once it expires (2.334.0 now returns 403 and exit code 7). Tracking latest avoids the recurring outage; the build forces a base image pull so inline cache cannot pin a stale digest. Co-authored-by: Cursor <cursoragent@cursor.com>
latest only resolves at build time; a published image is still a frozen snapshot, so tracking latest does not avoid the next deprecation outage and obscures which runner version each release contains. Pin 2.336.0 explicitly (current actions/runner release) to unblock ARC runners that fail with exit code 7 on deprecated 2.334.0. Co-authored-by: Cursor <cursoragent@cursor.com>
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背景
arc-runners命名空间下所有 runner Pod 启动数秒后退出、被控制器反复重建。runner 容器日志：GitHub 已把
2.334.0判为过期并拒绝下发任务，而 ARC 模式下 runner 自更新是关闭的（disableUpdate=true），版本完全由本镜像的基础镜像决定。上一次同样的问题在 9698714 修过一次（bump 到 2.334.0），现在轮到 2.334.0 自己过期。改动
Dockerfile基础镜像从ghcr.io/actions/actions-runner:2.334.0升到2.336.0（当前 actions/runner 最新正式版）。latest：构建时解析到的 digest 会随发布镜像一起冻结，GitHub 再升版本也不会自动跟上，反而让每个 release 里的 runner 版本不清晰。后续
合并后 release-please 出 v1.5.4 并推镜像到 Harbor，随后在 cluster 仓库把
playbooks/sites/arc/vars.yaml的github_runner_image指向新 tag 并重新部署。