Run docker workflow on Astera builder

[xraymemory]

Summary

• run Docker publish jobs on the Astera builder runner so Harbor access stays behind the VPN
• use a pinned skopeo container instead of apt-installing skopeo on the runner
• remove GitHub-hosted runner disk cleanup steps from self-hosted jobs

Validation

• mirrored checkpoint image locally and verified Docker Hub digest matches sha256:ff1dd2b42c3afd593e034cf81df1bf1862c27ae491f46cc10e105629f1102781
• git diff --check
• parsed .github/workflows/docker.yml with Ruby YAML loader
• tested the pinned skopeo inspect command locally

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1f6d538b-7989-49e4-aad8-974d61dab024

📥 Commits

Reviewing files that changed from the base of the PR and between aa4cdcf and 74bf088.

📒 Files selected for processing (1)

• .github/workflows/docker.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/astera-docker-runners

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[Copilot]

Pull request overview

This PR updates the Docker publishing GitHub Actions workflow to run on the Astera self-hosted builder (keeping Harbor access behind the VPN) and to execute skopeo via a pinned container image instead of installing it on the runner.

Changes:

• Switch Docker publish jobs from ubuntu-latest to the astera-sh-builder self-hosted runner.
• Replace runner apt-get install skopeo usage with docker run quay.io/skopeo/stable@sha256:… for skopeo copy and skopeo inspect.
• Remove GitHub-hosted runner disk cleanup steps from the self-hosted jobs.

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