The remote gen-index.sh call never had MINISIGN_SEC_KEY wired through, so a
missing/misconfigured secret silently produced an unsigned index.json that
overwrote the previously-signed one instead of failing the job — this is
why bread's dev track never appeared in dl.breadway.dev/dev/index.json
after the first dev-release.yml run despite it reporting success.
Mirrors the new stable/beta/dev track feature landing in bread-ecosystem's
bakery. dev-release.yml publishes on every push to dev; beta-release.yml
publishes on a beta-v* tag. Both skip the GitHub Release upload step and
publish to dl.breadway.dev/{dev,beta}/bread/ via gen-index.sh's new TRACK
env var. See bread-ecosystem/docs/release-channels.md for the full policy.
