CI: single-trunk model — dev triggers on main, beta becomes RC-tag-triggered

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.

.forgejo/workflows/rc-bakery.yml

@@ -0,0 +1,74 @@
+name: beta (rc) bakery
+
+# Publishes a beta-track build for any `vX.Y.Z-rc.N` prerelease tag pushed
+# to `main` — there is no separate `beta` branch; "freezing" is just
+# pausing pushes to main while an RC gets tested. See
+# docs/release-channels.md for the release-track policy.
+on:
+  push:
+    tags: ['v*']
+    paths:
+      - 'bakery/**'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+      - '.forgejo/workflows/beta-bakery.yml'
+
+jobs:
+  build:
+    if: ${{ contains(github.ref_name, '-rc.') }}
+    runs-on: [self-hosted, hestia]
+    steps:
+      - name: checkout
+        run: |
+          set -euo pipefail
+          rm -rf src && mkdir src
+          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
+            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
+
+      - name: build
+        run: cd src && cargo build --release --locked -p bakery
+
+      - name: test
+        run: cd src && cargo test --release --locked -p bakery
+
+      - name: prepare artifacts
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/beta/bakery/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp "src/target/release/bakery" "${PKG_DIR}/bakery-x86_64"
+          strip "${PKG_DIR}/bakery-x86_64"
+          sha256sum "${PKG_DIR}/bakery-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/bakery-x86_64.sha256"
+          cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "/srv/breadway-dl/beta/bakery/latest"
+
+      - name: sign beta binary
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          PKG_DIR="/srv/breadway-dl/beta/bakery/${VERSION}"
+          if [ -n "${MINISIGN_SEC_KEY:-}" ]; then
+            minisign -W -S -s "${MINISIGN_SEC_KEY}" -m "${PKG_DIR}/bakery-x86_64" \
+              -x "${PKG_DIR}/bakery-x86_64.minisig" </dev/null
+            echo "signed bakery-x86_64"
+          else
+            echo "::warning::BAKERY_MINISIGN_SEC_KEY_PATH not set — shipping bakery-x86_64 UNSIGNED"
+          fi
+
+      # No GitHub Release upload step here, unlike release-bakery.yml — beta
+      # builds happen on every push while the branch is frozen for testing,
+      # so dl.breadway.dev/beta/ is the only distribution point for this track.
+      - name: regenerate beta index.json
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+          TRACK: beta
+        run: |
+          set -euo pipefail
+          if [ -z "${MINISIGN_SEC_KEY:-}" ]; then
+            echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate beta index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone on the beta track)"
+            exit 1
+          fi
+          cd src && bash scripts/gen-index.sh