Dynamic versioning of Warewulf releases broke the release process. This
simplifies and fixes finding of release artifacts during tagged-release.
This also removes CentOS 7 as a release target, as previous attempts to
fix building on CentOS 7 by omitting the API still failed to run the
testsuite.
Signed-off-by: Jonathon Anderson <janderson@ciq.com>
79b8853cd8