Add multi-arch image build and push to Quay.io

[clcollins]

Summary

• Add image-build-push.yaml workflow for multi-arch (amd64+arm64) container image builds pushed to quay.io/chcollin/gort
• Use Quay robot account secrets (QUAY_ROBOT_USERNAME/QUAY_ROBOT_TOKEN) matching dwarfbot PR docs: add setup guide for integrations #11
• Update Containerfile with OCI labels and remove hardcoded GOARCH for multi-platform support
• Update CI image-build job to validate OCI labels with podman

Test plan

• Verify QUAY_ROBOT_USERNAME and QUAY_ROBOT_TOKEN secrets are set in repo settings
• Confirm PR build triggers image-build-push workflow (build only, no push)
• Merge and confirm push to main triggers a successful image build and push to quay.io/chcollin/gort:latest
• Tag a release and confirm multi-tag push works (sha, v-prefixed, bare version)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds automated multi-arch (amd64/arm64) container image build & publish to Quay.io, and standardizes image metadata via OCI labels so the CI pipeline can validate built artifacts.

Changes:

• Add OCI/metadata labels to the runtime image and remove the hardcoded GOARCH to support multi-platform builds.
• Introduce a new GitHub Actions workflow to build amd64+arm64 images and push a multi-arch manifest to Quay on main/tag events.
• Update existing CI container build job to use Podman and validate required OCI labels via podman inspect.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
Containerfile	Enables multi-arch builds and adds OCI + project-specific labels via build args.
.github/workflows/image-build-push.yaml	New workflow to build amd64/arm64 images, create a manifest list, and push tags to Quay (skips push on PRs).
.github/workflows/ci.yaml	Switches CI image build to Podman and adds label validation checks.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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[clcollins]

@clcollins PR #4 has been fully qualified.

Qualification Summary:

• Loops: 3 iteration(s) of Phases 1–4
• New commits: 2 commit(s) added during qualification
• CI: ⏭️ N/A (no checks configured for claude/add-copilot-evaluation-R8OiQ base branch)
• Copilot: ✅ Clean after 4 rounds — 4 comments addressed (ARG quotes, log messages, registry alignment, PR description)
• CodeRabbit: ⏭️ N/A (not enabled)
• Codecov: ⏭️ N/A (no checks on this base branch)
• Merge: ✅ No conflicts (MERGEABLE/CLEAN)

Intent validation: The PR still fulfills its original intent. All changes made during qualification (Copilot feedback on ARG quoting, log message accuracy, and registry name consistency) are consistent with the PR's purpose of adding multi-arch image build and push to Quay.io.

This PR is ready to merge.

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Qualified by Claude on behalf of @clcollins