CI: add release workflow

.github/workflows/release.yml

@@ -0,0 +1,54 @@
+name: release
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+env:
+  DL_DIR: /srv/breadway-dl
+  ECOSYSTEM_DIR: /tmp/bread-ecosystem-ci
+
+jobs:
+  build:
+    runs-on: [self-hosted, hestia]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: build
+        run: cargo build --release --locked
+
+      - name: prepare artifacts
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="${DL_DIR}/breadmon/${VERSION}"
+          mkdir -p "${PKG_DIR}"
+          cp "target/release/breadmon" "${PKG_DIR}/breadmon-x86_64"
+          strip "${PKG_DIR}/breadmon-x86_64"
+          sha256sum "${PKG_DIR}/breadmon-x86_64" | awk '{print $1}' \
+            > "${PKG_DIR}/breadmon-x86_64.sha256"
+          cp bakery.toml "${PKG_DIR}/bakery.toml"
+          ln -sfn "${VERSION}" "${DL_DIR}/breadmon/latest"
+
+      - name: ensure bread-ecosystem
+        run: |
+          rm -rf "${ECOSYSTEM_DIR}"
+          git clone https://github.com/Breadway/bread-ecosystem.git "${ECOSYSTEM_DIR}"
+
+      - name: regenerate index.json
+        run: bash "${ECOSYSTEM_DIR}/scripts/gen-index.sh"
+
+      - name: upload to GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          PKG_DIR="${DL_DIR}/breadmon/${VERSION}"
+          gh release create "${GITHUB_REF_NAME}" \
+            --title "breadmon v${VERSION}" --generate-notes 2>/dev/null || true
+          gh release upload "${GITHUB_REF_NAME}" \
+            "${PKG_DIR}/breadmon-x86_64" \
+            "${PKG_DIR}/breadmon-x86_64.sha256" \
+            --clobber