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/beta-bread-theme.yml

@@ -1,88 +0,0 @@
-name: beta bread-theme
-
-# Publishes a beta-track build on every push to `beta` — a frozen
-# stabilization branch cut from `dev` when ready to stabilize; only
-# fix/<issue> branches merged into `beta` should land here afterward.
-# See docs/release-channels.md for the three-track policy this is part of.
-on:
-  push:
-    branches: ['beta']
-    paths:
-      - 'bread-theme/**'
-      - 'Cargo.toml'
-      - 'Cargo.lock'
-      - '.forgejo/workflows/beta-bread-theme.yml'
-
-jobs:
-  build:
-    runs-on: [self-hosted, hestia]
-    steps:
-      - name: checkout
-        run: |
-          set -euo pipefail
-          rm -rf src && mkdir src
-          git clone --branch beta --depth 1 \
-            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" src
-
-      - name: build
-        run: cd src && cargo build --release --locked -p bread-theme --bin bread-theme
-
-      - name: compute beta version
-        run: |
-          set -euo pipefail
-          cd src
-          # Base the beta version off the latest published stable tag,
-          # not Cargo.toml — Cargo.toml can go stale relative to the last
-          # real release (seen in practice: breadbox/breadpad/breadcrumbs/
-          # breadpaper), which would make a beta build sort as OLDER than
-          # what's already installed and bakery would correctly refuse it.
-          LATEST_TAG="$(git ls-remote --tags --refs \
-            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" 'v*' \
-            | awk -F/ '{print $NF}' | sed 's/^v//' | sort -V | tail -1)"
-          if [ -n "${LATEST_TAG}" ]; then
-            CUR="${LATEST_TAG}"
-          else
-            CUR="$(grep -m1 '^version' Cargo.toml | sed -E 's/.*"(.*)".*/\1/')"
-          fi
-          IFS='.' read -r MA MI PA <<< "${CUR}"
-          SHA="$(git rev-parse --short HEAD)"
-          TS="$(date -u +%Y%m%d%H%M%S)"
-          echo "VERSION=${MA}.${MI}.$((PA + 1))-beta.${TS}+${SHA}" >> "$GITHUB_ENV"
-
-      - name: prepare artifacts
-        run: |
-          set -euo pipefail
-          PKG_DIR="/srv/breadway-dl/beta/bread-theme/${VERSION}"
-          mkdir -p "${PKG_DIR}"
-          cp "src/target/release/bread-theme" "${PKG_DIR}/bread-theme-x86_64"
-          strip "${PKG_DIR}/bread-theme-x86_64"
-          sha256sum "${PKG_DIR}/bread-theme-x86_64" | awk '{print $1}' \
-            > "${PKG_DIR}/bread-theme-x86_64.sha256"
-          cp src/bread-theme/bakery.toml "${PKG_DIR}/bakery.toml"
-          ln -sfn "${VERSION}" "/srv/breadway-dl/beta/bread-theme/latest"
-
-      - name: sign beta binary
-        env:
-          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
-        run: |
-          set -euo pipefail
-          PKG_DIR="/srv/breadway-dl/beta/bread-theme/${VERSION}"
-          if [ -n "${MINISIGN_SEC_KEY:-}" ]; then
-            minisign -W -S -s "${MINISIGN_SEC_KEY}" -m "${PKG_DIR}/bread-theme-x86_64" \
-              -x "${PKG_DIR}/bread-theme-x86_64.minisig" </dev/null
-            echo "signed bread-theme-x86_64"
-          else
-            echo "::warning::BAKERY_MINISIGN_SEC_KEY_PATH not set — shipping bread-theme-x86_64 UNSIGNED"
-          fi
-
-      - 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