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fix: parse PR number from merge commit message - #16
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The GitHub API /commits/{sha}/pulls returns empty for merge commits
because the merge commit is not part of the PR's commit list — it only
exists in main's history after the PR is closed. This caused the apply
job to fail with "Could not determine PR number".
Extract the PR number from the commit message instead, which works for
both merge strategies GitHub supports:
- Regular merge: "Merge pull request #37 from owner/branch"
- Squash merge: "Some title (#37)"
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The inline ${{ steps.apply_summarize.outputs.summary }} substitution
happens before bash evaluates the script. When the summary contains
Terragrunt output with paths like 'iac/prod/github' or tokens like
'github_repository.default[0]::', bash interprets them as commands,
causing 'command not found' errors.
Use env: + printf '%s\n' "$SUMMARY" (same pattern as the plan job's
Write plan summary to file step) to pass the value through the
environment instead of inline substitution.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Problem
The apply job failed with:
The
/commits/{sha}/pullsGitHub API returns empty for merge commits — the merge commit only exists inmain's history after the PR closes, not in the PR's own commit list.Fix
Parse the PR number from the merge commit message, which GitHub always embeds:
Merge pull request #37 from owner/branchSome title (#37)Pattern:
grep -oP '(?<=pull request #)\d+|(?<=\(#)\d+(?=\))'🤖 Generated with Claude Code