Support for semver-tagged GHCR docker images

[capsulecorplab]

Is your feature request related to a problem? Please describe.
Docker images are currently not tagged with a (semantic) version, making it difficult to debug potential issues between releases or for "pinning" images (albeit, directly using geocml-base-deployment images or as a base image in a downstream docker image build).

Describe the solution you'd like
Append a semver tag to docker images, if the git commit has an associated semver-shaped git tag, as part of image builds published to GHCR.

[TristanDamron]

@capsulecorplab With #131 we can now have users pull containers from GHCR in production (I removed the need for build-time arguments by refactoring the containers to only require run-time args)

I'm going to slate this for geoCML 4.0; I think users will really want to take advantage of this ASAP.

[capsulecorplab]

@capsulecorplab With #131 we can now have users pull containers from GHCR in production (I removed the need for build-time arguments by refactoring the containers to only require run-time args)

I'm going to slate this for geoCML 4.0; I think users will really want to take advantage of this ASAP.

Cool! If you're in need of any examples that don't work, I've had a couple of failed attempts at implementing this over at https://github.com/capsulecorplab/geocml-base-deployment/tree/add-support-for-semver-tagged-docker-images 🙃