The fixed /tmp/bread-ecosystem-ci path races when multiple repos' dev/beta
workflows run close together on the same self-hosted runner — one job's
rm -rf/clone can stomp another's in-progress checkout, causing the
regenerate-index step to fail intermittently. Switch to mktemp -d.
Adds dev-release.yml (publishes on every push to dev) and beta-release.yml
(publishes on a beta-v* tag), mirroring the pattern landing in
bread-ecosystem/bread. Also creates the dev branch for this repo, which
didn't exist before — see bread-ecosystem/docs/release-channels.md for the
three-track policy.
GitHub Actions self-hosted runners require per-repo registration on a
personal (non-org) account — every new bakery repo needed a manually
provisioned runner on hestia, which nobody had noticed was broken
until this session. Forgejo Actions' runner already serves every repo
with zero registration. Moves release.yml there (dl.breadway.dev is
the primary bakery fetch target either way; GitHub release upload is
kept as the fallback path, now via an explicit token since Forgejo
Actions has no ambient GITHUB_TOKEN), and adds a mirror workflow to
keep GitHub in sync automatically instead of manual dual-remote pushes.
