Add CodeQL

[tkatila]

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[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 code scanning for this repository, enabling automated security/static analysis on pushes, PRs, and a scheduled run.

Changes:

• Introduces a new .github/workflows/codeql.yml workflow that runs CodeQL on main pushes/PRs, on a weekly cron schedule, and via manual dispatch.
• Configures a matrix to analyze both actions and go languages and uploads results as artifacts.

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