Clean-up Docker Image Job to Produce Tags

[GregHattJr]

Currently the docker-image.yml build job runs only on main and pushes to the tag 'latest'. Should clean up this job and pull out the reusable parts to be able to cut releases against tag names AND latest. This would involve separating the build and push jobs and using an action that triggers on tag.

https://docs.github.com/en/actions/sharing-automations/reusing-workflows