The github-pages gem can't satisfy your Gemfile's dependencies. If you want to use a different Jekyll version or need additional dependencies, consider building Jekyll site with GitHub Actions: https://jekyllrb.com/docs/continuous-integration/github-actions/

This run of the CodeQL Action does not have permission to access Code Scanning API endpoints. As a result, it will not be opted into any experimental features. This could be because the Action is running on a pull request from a fork. If not, please ensure the Action has the 'security-events: write' permission. Details: Resource not accessible by integration

Feature flags do not specify a default CLI version. Falling back to the CLI version shipped with the Action. This is 2.16.4.