Actions for building and releasing manifests

[powerfooI]

Summary

Create and test 4 workflow for building and releasing.

1. workflow build which builds images in amd64 and arm64 arch respectively
2. workflow release-charts derives from original release workflow, which packs helm charts and release them and will be triggered by pushing tag "X.Y.Z"
3. workflow release-images builds images for amd64 and arm64 platforms and push them to specific docker registry. This workflow will be triggered by pushing tag "X.Y.Z"
4. workflow release-distributions builds and push images of observer, obconfigserver, obproxy and obagent with tag [comp]-[version].

In workflow release-images, tag "X.Y.Z" will be used as tag of product images. And the following secrets and vars will be used in steps:

• secrets.DOCKER_USERNAME, username to log in Docker Hub
• secrets.DOCKER_PASSWORD, password matching the given username
• vars.DOCKER_PUSH_BASE, should be repo in format repo/image, like oceanbase in oceanbase/ob-operator

[powerfooI]

fix #107

[chris-sun-star]

LGTM