CI: onboard breadarr onto the bakery distribution system

Adds bakery.toml (system_deps verified via ldd + Command::new grep against
breadarrd/src, not guessed) and dev-release.yml/rc-release.yml/release.yml
following bread-ecosystem's current single-trunk + RC-tag CI model. No
GitHub Release step anywhere — this repo has no GitHub mirror.

.forgejo/workflows/release.yml

@@ -0,0 +1,79 @@
+name: release
+
+on:
+  push:
+    tags: ['v*']
+
+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/${GITHUB_REPOSITORY}.git" src
+
+      - name: build
+        run: cd src && cargo build --release --locked
+
+      - name: prepare artifacts
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/breadarr/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          for bin in breadarrd breadarr-tui; do
+            cp "src/target/release/${bin}" "${PKG_DIR}/${bin}-x86_64"
+            strip "${PKG_DIR}/${bin}-x86_64"
+            sha256sum "${PKG_DIR}/${bin}-x86_64" | awk '{print $1}' \
+              > "${PKG_DIR}/${bin}-x86_64.sha256"
+          done
+          cp src/packaging/systemd/breadarrd.service "${PKG_DIR}/"
+          cp src/bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "/srv/breadway-dl/breadarr/latest"
+
+      # Signs with the shared bakery ecosystem signing key (same key that
+      # signs index.json). BAKERY_MINISIGN_SEC_KEY_PATH is a *path on this
+      # runner's disk* (hestia has persistent storage), not the key
+      # contents. Dormant (binaries ship unsigned) until that secret is
+      # provisioned for this repo.
+      - name: sign release binaries
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="/srv/breadway-dl/breadarr/${VERSION}"
+          if [ -n "${MINISIGN_SEC_KEY:-}" ]; then
+            for bin in breadarrd breadarr-tui; do
+              minisign -W -S -s "${MINISIGN_SEC_KEY}" -m "${PKG_DIR}/${bin}-x86_64" \
+                -x "${PKG_DIR}/${bin}-x86_64.minisig" </dev/null
+              echo "signed ${bin}-x86_64"
+            done
+          else
+            echo "::warning::BAKERY_MINISIGN_SEC_KEY_PATH not set — shipping breadarrd-x86_64/breadarr-tui-x86_64 UNSIGNED"
+          fi
+
+      - name: regenerate index.json
+        env:
+          MINISIGN_SEC_KEY: ${{ secrets.BAKERY_MINISIGN_SEC_KEY_PATH }}
+        run: |
+          set -euo pipefail
+          if [ -z "${MINISIGN_SEC_KEY:-}" ]; then
+            echo "::error::BAKERY_MINISIGN_SEC_KEY_PATH secret not set — refusing to regenerate stable index.json unsigned (would leave a stale signature mismatched against fresh content and break bakery for everyone on the stable track)"
+            exit 1
+          fi
+          rm -rf /tmp/bread-ecosystem-ci-* 2>/dev/null || true
+          # mktemp: a fixed clone path races when multiple repos' release
+          # workflows run close together on the same self-hosted runner.
+          ECOSYSTEM_CI_DIR="$(mktemp -d /tmp/bread-ecosystem-ci-XXXXXX)"
+          git clone https://git.breadway.dev/Breadway/bread-ecosystem.git "${ECOSYSTEM_CI_DIR}"
+          bash "${ECOSYSTEM_CI_DIR}/scripts/gen-index.sh"
+          rm -rf "${ECOSYSTEM_CI_DIR}"
+
+      # No GitHub Release upload step — breadarr has no GitHub mirror,
+      # unlike most sibling bread-ecosystem repos. dl.breadway.dev is the
+      # only distribution point for this repo.