Skip validate job when skill matrix is empty

[Copilot]

GitHub Actions fails when the skill matrix vector contains no values. This occurs when no .github/skills/** files are modified in a push/PR.

Changes

• Uncommented if: needs.detect-changes.outputs.skills != '[]' condition in validate job
• Job now skips instead of failing when matrix is empty

validate:
  needs: detect-changes
  if: needs.detect-changes.outputs.skills != '[]'  # Previously commented out
  runs-on: ubuntu-latest
  strategy:
    matrix:
      skill: ${{ fromJson(needs.detect-changes.outputs.skills) }}

The condition was already present but commented out. This change activates it to prevent matrix evaluation errors.

Original prompt

See the logs in run https://github.com/rajbos/github-copilot-token-usage/actions/runs/21785946769

We get this message in the matrix config, which currently fails the run. it isfine if the matrix is empty, that just means we can skip the matrix itself.

add a check of if statement that will skip the matrix then, instead of causing the failure

Annotations
2 errors
Validate Skills
Error when evaluating 'strategy' for job 'validate'. .github/workflows/validate-skills.yml (Line: 68, Col: 16): Matrix vector 'skill' does not contain any values
Validate Skills
Error when evaluating 'strategy' for job 'validate'. .github/workflows/validate-skills.yml (Line: 68, Col: 16): Matrix vector 'skill' does not contain any values

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