semantic-release resolves the release branch and then pushes a commit
and a tag to it, so a local branch named main is a better starting
point than the --detach the other five workflows use. Still pinned to
the pushed commit rather than to whatever main points at by the time
the container starts.
The floor tag falls back to the PAT when GITEA_TOKEN is unset, which is
safe rather than merely convenient: all four publishers skip v0.0.0
explicitly, so the worst case is four jobs that start and immediately
say there is nothing to build.
logan
9ce79ee416