fix: update base ref fallback with different path

[vladzabolotnyi]

We don't have a documentation explicitly describing the repository property on github. Current change referencing this discussion:
https://github.com/orgs/community/discussions/54817

[probelabs]

This PR fixes a bug in the dependency-guard.yml GitHub Actions workflow by correcting the fallback path for the base reference. The expression to get the repository's default branch was updated from github.repository.default_branch to github.event.repository.default_branch.

This ensures that the workflow can reliably determine the base branch for comparison, even in contexts where github.event.pull_request.base.ref might not be available, preventing potential failures in the dependency change check.

Files Changed Analysis

• .github/workflows/dependency-guard.yml: A single-line change in the workflow definition to correct a GitHub context variable.

Architecture & Impact Assessment

• What this PR accomplishes: It corrects a variable path in the dependency-guard workflow to ensure the fallback mechanism for determining the base git reference works correctly.
• Key technical changes introduced: The GitHub Actions expression for the BASE_REF environment variable was changed from github.repository.default_branch to github.event.repository.default_branch.
• Affected system components: The change is isolated to the dependency-guard CI job. This job is responsible for checking for dependency changes in pull requests, and this fix improves its reliability.

Scope Discovery & Context Expansion

The change is highly localized to the dependency-guard.yml workflow. The fix ensures that the git fetch command within the workflow receives the correct default branch name when the pull request's base reference is not directly available from the event payload. This prevents the job from failing due to an incorrect git reference. The impact is limited to the execution of this specific CI check and has no effect on production code or other services.

Metadata

• Review Effort: 1 / 5
• Primary Label: bug

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Last updated: 2026-04-06T11:23:08.313Z | Triggered by: pr_opened | Commit: 868d754

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[probelabs]

✅ Security Check Passed

No security issues found – changes LGTM.

✅ Architecture Check Passed

No architecture issues found – changes LGTM.

✅ Performance Check Passed

No performance issues found – changes LGTM.

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Last updated: 2026-04-06T11:23:00.309Z | Triggered by: pr_opened | Commit: 868d754

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