Fix pr-status to work without --pr parameter

[Copilot]

The pr-status command fails when --pr is omitted because getPrNumber() calls process.exit(1) on missing PR, which bypasses the try-catch meant to handle this case. This breaks merge queue workflows where only --sha is available.

Changes

• packages/core/src/auto.ts: Changed prStatus() to call getPrNumberFromEnv() directly instead of getPrNumber(). This returns undefined when no PR is found, allowing the existing fallback logic to use the provided SHA or HEAD.
• packages/core/src/tests/auto.test.ts: Removed assertion for process.exit call in test that was validating the buggy behavior.

Example

This now works in merge queue events:

auto pr-status \
  --sha ${{ github.sha }} \
  --context "Auto PR Check" \
  --state success \
  --description "PR labels validated"

Original prompt

---

This section details on the original issue you should resolve

<issue_title>pr-status doesn't work when we don't pass the optional --pr parameter</issue_title>
<issue_description>Describe the bug

the pr-status command has an optional parameter --pr. This command was design to only use the PR number when we don't pass a --sha parameter. Even if we don't pass the --sha and --pr parameters, the command was designed to obtain the sha from the HEAD of the current branch.

The code has a try-catch to prevent auto from throwing an error when the PR number is not available. But this try-catch is not working because the getPrNumber() function calls process.exit(1). The try-catch is not able to stop that.

auto/packages/core/src/auto.ts

Line 1831 in 27b93e3

process.exit(1);

auto/packages/core/src/auto.ts

Lines 955 to 959 in 27b93e3

	try {
	prNumber = this.getPrNumber("pr", pr);
	} catch (error) {
	// default to sha if no PR found
	}

To Reproduce

Try to create a commit status during the merge_group event (merge queue) (or even the push event). This might be needed when Auto PR Check is a required status check that is set by auto pr-check in the pull_request event. Since it's a required status check, for repos using the merge queue, it also needs to be set during merge_group event (merge queue). In this case, there's no PR number. It should be enough using --sha ${{ github.sha }}.

auto pr-status --url ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }} --context "Auto PR Check" --sha ${{ github.sha }} --state success --description "PR labels validated in original PR"

Expected behavior

pr-status should work even if we don't pass the --pr parameter.

Screenshots

Environment information:

ℹ  info      ENV: {
  isCi: true,
  name: 'GitHub Actions',
  service: 'github',
  commit: 'dfd<redacted>f9d',
  build: '1<redacted>2',
  isPr: false,
  branch: 'gh-readonly-queue/main/pr-123-efb<redacted>de6',
  prBranch: undefined,
  slug: '<redacted>/<redacted>',
  root: '/home/<redacted>'
}

Additional context

N/A
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes pr-status doesn't work when we don't pass the optional --pr parameter #2507

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