Enable GitHub Advanced Security/CodeQL

[mwtrew]

Status

• Related to https://github.com/RaspberryPiFoundation/digital-editor-issues/issues/1699

What's changed?

• Adds GitHub's security scanning action to our CI workflow.

Steps to perform after deploying to production

Applies to CI only.

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to run CodeQL “Advanced” code scanning for this Rails (Ruby) codebase, enabling GitHub Advanced Security/code scanning results on pushes and PRs.

Changes:

• Introduces a new .github/workflows/codeql.yml workflow that runs CodeQL analysis for Ruby on push and pull_request to main.
• Configures CodeQL init/analyze steps and job permissions for uploading code-scanning results.

Suppressed comments (1)

.github/workflows/codeql.yml:97

• github/codeql-action/analyze is referenced by a floating major tag (@v4). To match the repository’s action-pinning convention and to avoid zizmor CI failures, pin this action to a specific commit SHA (see .github/workflows/ci.yml:40-55 for precedent).

      - name: Perform CodeQL Analysis
        uses: github/codeql-action/analyze@v4
        with:
          category: "/language:${{matrix.language}}"

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[github-actions]

Test coverage

92.18% line coverage reported by SimpleCov.
Run: https://github.com/RaspberryPiFoundation/editor-api/actions/runs/31489670832