GitLab

Flesh out our github actions CI so we can build official releaes.

Allow overriding the platform, image name, and tag latest for
standard and rocm images.

This adds ROCm support back as a discrete image.

If a VERSION is not specified, this will generate a version string that
represents the state of the repo.  For example `0.1.21-12-gffaf52e1-dirty`
representing 12 commits away from 0.1.21 tag, on commit gffaf52e1
and the tree is dirty.