ci: add CodeQL analysis for GitHub Actions workflows

[markuslf]

packaging was the only repository without a CodeQL workflow, which left dependency-review as its single check on a pull request. The workflow is the one from kickstart, which is the other repository that ships no Python and therefore analyses the actions language 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.