Use Rancher CI image for CI tasks

[richard-cox]

• Update our CI pipelines to use https://github.com/rancher/ci-image#available-images
• These are more secure, and comes with a range of tools - https://github.com/rancher/ci-image/blob/main/deps.yaml
• We may need to request things like yarn in the node images

[github-actions]

🤖 Issue grooming questions

Thanks for filing this enhancement! The problem statement and technical references are clear. One primary criterion is missing before this can be triaged:

1. Acceptance Criteria — What defines "done" for this migration? Please add 1–3 concrete, testable criteria. For example:
   • All CI pipeline jobs that previously used non-Rancher base images now use the appropriate Rancher CI image (e.g., rancher/ci-image)
   • Required tools (e.g., yarn, node) are available in the selected Rancher CI image, or a request has been made to add them
   • CI pipelines pass with the new images (no regressions introduced by the image swap)

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