Replaces the dev/beta branch split with one trunk (main): dev-track
builds still publish on every push, but the beta track now publishes
from a vX.Y.Z-rc.N prerelease tag instead of a separately-maintained
beta branch. Removes the branch nobody reliably kept in sync.
.github/workflows/release.yml built and published the bakery binary
itself, but it lived under .github/ and targeted runs-on:
[self-hosted, hestia] — a runner label only registered against
Forgejo, never against GitHub Actions. It has therefore never run;
get.sh has been pointing at dl.breadway.dev/bakery/... this whole time
with nothing actually publishing there.
Recreated the same logic as .forgejo/workflows/release-bakery.yml,
matching the sibling release-bread-theme.yml in this repo (manual
clone instead of actions/checkout, GH_RELEASE_TOKEN instead of the
GitHub-provided GITHUB_TOKEN, same dormant-until-provisioned minisign
signing step). Removed the dead .github copy.
