[Copilot]

Problem

codeql.yml used the default GitHub-generated workflow with a static, hardcoded language matrix (python only). Changes to this action's own code (main.py, Dockerfile, entrypoint.sh, action.yml) had no automated check exercising the actual Docker build and matrix-generation logic.

Changes

• create-matrix job: checks out the repo and invokes the action from the local checkout (uses: ./) against github.event.repository.languages_url, building the Docker image fresh on every run.
• analyze job: now consumes needs.create-matrix.outputs.matrix instead of the hardcoded python entry, and is skipped entirely (if: needs.create-matrix.outputs.matrix != '[]') when the matrix is empty.

Because the workflow references ./ rather than a pinned tag (e.g. @v1), any future change to the action is built and run as part of this repo's own CI/CodeQL workflow:

create-matrix:
  runs-on: ubuntu-latest
  outputs:
    matrix: ${{ steps.set-matrix.outputs.matrix }}
  steps:
    - uses: actions/checkout@v7
    - id: set-matrix
      uses: ./
      with:
        access-token: ${{ secrets.GITHUB_TOKEN }}
        endpoint: ${{ github.event.repository.languages_url }}

analyze:
  needs: create-matrix
  if: ${{ needs.create-matrix.outputs.matrix != '[]' }}
  strategy:
    matrix: ${{ fromJSON(needs.create-matrix.outputs.matrix) }}

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