Migrate from Drone CI to GitHub Action

[jiaqiluo]

Some notes on this PR:

• It is raised from a branch in the rancher/machine repo for the CI to be triggered ( the CI will not run if the PR is from a forked repo AND the target repo does not contain a workflow file).
• The FOSSA step is expected to fail, and per the EIO's suggestion, the directive continue-on-error: true is used to unblock other jobs( in the event of pushing a tag)
• The reference for how to use Docker action to build mult-arch image: https://docs.docker.com/build/ci/github-actions/multi-platform/

Dev validation:

• The validation for the workflow in the event of PR is done in this PR, see the "checks" section at the bottom of the page.
• The validation for the workflow in the event of a new tag being pushed is done in my fork where a tag is cut from a branch that contains the same code (except the fossa step and how the credentials are retrieved) as this PR:
  • v0.15.0-test8 is used as the tag to mimic the real tag such as v0.15.0-rancher112
  • the GHA run is passed: https://github.com/jiaqiluo/machine/actions/runs/8837729141
  • the Docker images are pushed: jq20/machine:v0.15.0-test8 for both linux/amd64 and linux/arm64
  • the GitHub Release with assets is created: https://github.com/jiaqiluo/machine/releases/tag/v0.15.0-test8

SURE-7998