Remove "Collect and save changed Containerfile(s) used by Docker Official Library" job from the "Build, test and push to the Client Library" workflow.
It is now part of the "Deploy version_major images_type images" job.
Update README.md.
Implement CI/CD workflow with GitHub Actions:
- to build, test and push container images to Client Library.
- to publish images to the Docker Official Library.
Add documentation: README.md