Avoid pulling tag contents into computed version name (#4621)
Avoid pulling tag contents into computed version name (#4621)

Doing a `git show` on a signed tag will output the full tag message,
*even if* `--format` was specified asking for limited information.

Avoid this by making sure to run on the commit pointed to by the tag,
instead of the tag itself.
edgedb/edgedb,edgedb/edgedb,edgedb/edgedb