Docker image publish to Digital Ocean Image Registry

[vtno]

I have a use case where I would like to build and releasee a docker image to a remote registry. The first one that would be of any use for me is DO.

This could be 2 actions:

1. docker-build
2. docker-release

and another workflow

1. docker-build-and-release

Acceptance Criteria

• User should be able to add custom ENVs into the action to build their image
• User should be able to apply their DO token to authenticate
• The build should be cached and reusable between 2 actions