Suggested test: copilot/push-to-pull-request-branch-head-only-bundle

[github-actions]

Motivation

github/gh-aw#51833 (fixes github/gh-aw#50740) — push_to_pull_request_branch failed when a filtered git bundle advertised only HEAD (no refs/heads/<branch> entry), leaving valid agent changes unapplied. The fix adds bundle-heads inspection and fallback to a validated HEAD SHA.

Proposed test

• Workflow file: test-copilot-push-to-pull-request-branch-head-only-bundle.md
• Trigger: workflow_dispatch
• Engine: copilot
• Safe output: push-to-pull-request-branch
• Variant: standard (or nosandbox if bundle filtering requires disabling sandbox git filtering)

Minimal test prompt sketch

Have the agent make a small file change and push it via push-to-pull-request-branch against a target PR/branch, under conditions that force the git bundle to only contain a HEAD entry (e.g. via a filtered/shallow bundle triggered by the sandbox's git object filtering). Assert the push succeeds and the branch is updated.

New fixtures or secrets needed

None expected — reuses existing PR-branch push fixtures from test-copilot-push-to-pull-request-branch-using-dispatch.md.

Notes

Existing push-to-pull-request-branch tests (test-copilot-push-to-pull-request-branch-using-dispatch.md, test-copilot-nosandbox-push-to-pull-request-branch.md) exercise the normal named-ref bundle path but not the HEAD-only bundle edge case. Open question: it's unclear how to reliably force the underlying git bundle mechanism into the HEAD-only shape from a workflow prompt alone (this may be an internal sandbox/runtime condition not directly controllable via workflow_dispatch inputs) — needs feasibility triage before converting to a PR.

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