implement build-push ci

[sunya-ch]

This PR mainly implements GitHub Action workflows for automatically building and pushing controller, bundle, and daemon images to the repository.

There are three workflows:

• build_push_controller: build and push controller and its bundle images
• build_push_daemon: build CNI, move to daemon local folder, and build and push daemon image
• unittest: run test for controller

To avoid unnecessary build and push,

• The code changes related to controller should be pushed to controller branch first to execute build_push_controller.
• Similarly, the code changes related to daemon should be pushed to daemon branch to execute build_push_daemon.
• As any change related to CI pipelines might affect image build and push, the first two workflows will be also executed on ci branch.

The unittest will be executed for all branches except explicitly non-related doc branch.

Detail modifications:

• to reduce confusion, re-add prefix (multi-nic-cni-) to the image name
• update daemon/CNI Makefile to suppress folder not found error
• update operator-sdk to latest version (v1.23.0)

Signed-off-by: Sunyanan Choochotkaew [email protected]

[tatsuhirochiba]

Thanks for quick implementation!