Setup CD MOA docker workflow

[garawalid]

This PR resolves the following points:

• Move the MOA docker image from Docker Hub to Github Container Registry
• Add MOA docker image workflow via Github action, it's triggered when a new tag is pushed. The job will publish both latest & devel tags.

We need to link the Container Registry to waikato/moa repository with write privileges. Please follow these steps in this Stackoverflow thread.

This PR was tested in my repository, see the following urls:

• Container Registry
• Github workflow execution

[garawalid]

I'll trigger the Github workflow with a test tag

[garawalid]

It seems that I can't trigger the workflow with a test tag in this branch, because the source branch is my repository. The workflow started in my fork

We might need to push a test tag in any branch to trigger the workflow.