[Feature]: GitHub / GitLab Pipeline Templates

[tuunit]

📝 Description

We would like to provide GitHub and GitLab native pipeline templates for allowing users of kubara to keep their environments up to date through automatic.

GitHub:

• Create a GitHub action for installing kubara and running it with parameters as exposed input fields. Similar to something like https://github.com/golangci/golangci-lint-action
• Create an example GitHub workflow to fetch the latest catalog releases for the bootstrap and general catalog and run kubara generate against the contents of the repo
• If drift/changes have been detected automatically open a PR
• Make the workflow runnable on-demand as well as with a schedule (daily)

GitLab:

• Create a GitLab pipeline to install kubara -> fetch the latest catalog releases for the bootstrap and general catalog -> run kubara generate against the contents of the repo -> If drift/changes have been detected automatically open a MR
• Make the pipeline runnable on-demand

🎯 Use Case

• GitOps drift detection
• Automated PRs/MRs for updating external catalog dependencies

📎 Additional Context

No response

✅ Checklist

• I have searched existing issues
• This is not a duplicate