Migrate CI/CD functionality to Keptn

Translate Keptn v1 CI/CD funtionality to Keptn resources

Note This section is under development. Information that is published here has been reviewed for technical accuracy but the format and content is still evolving. We hope you will contribute your experiences and questions that you have.

No two migrations are alike but these are some general guidelines for how to approach the project:

Last modified 2023-11-03: docs: release 0.9.0 (#2396) (fef5826)