If there are multiple tags pointing to HEAD we need to pick only
one. We'll take one that seems to be a version number. This allows
the version number tag to coexist with another tag, that perhaps
indicates which images it was used to build.
The previous system required making commits in order to do a new
build. This caused problems because we were using the git repo
directly for fedora builds and we couldn't use that exact version
when building matching packages because of needing to make new
commits in order to do the build.
Having the spec file in here also was unnecessary. It is easy to
just maintain the spec file in the Fedora package.
I still want to do a bit more future work with this to pick up
the version from a git tag.
