Repository archives are always named `<project>-<ref>-<sha>` even if
the ref is a commit. A consequence of always including the sha even
for tags is that packaging a release is more difficult because both
the ref and sha must be known by the packager.

- add append_sha option (defaults true) to provide a method for
toggling this feature.

Support added to GitLab Workhorse by gitlab-org/gitlab-workhorse!232