ci: add a workflow for release automation

Signed-off-by: Changyuan Lyu <changyuanl@google.com>

Author: Lencerf

.github/workflows/release.yml

@@ -0,0 +1,66 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v[0-9]+\\.[0-9]+\\.[0-9]+.*"
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build_alioth:
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+          - target: aarch64-unknown-linux-gnu
+            os: ubuntu-24.04-arm
+          - target: aarch64-apple-darwin
+            os: macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Build
+        run: RUSTFLAGS='-C target-feature=+crt-static' cargo +stable build --target ${{ matrix.target }} --release
+      - name: Upload artifact
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: alioth-${{ matrix.target }}
+          path: target/${{ matrix.target }}/release/alioth
+
+  build_bootloader:
+    uses: ./.github/workflows/bootloader.yml
+
+  create_release:
+    needs: [build_alioth, build_bootloader]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Download all artifacts
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+        with:
+          path: artifacts
+      - name: Create tarballs
+        run: |
+          tar -cvJf alioth-linux-x86_64.tar.xz \
+            -C $PWD/artifacts/alioth-x86_64-unknown-linux-gnu alioth \
+            -C $PWD/artifacts/bootloader-x86_64 kernel-x86_64
+          tar -cvJf alioth-linux-aarch64.tar.xz \
+            -C $PWD/artifacts/alioth-aarch64-unknown-linux-gnu alioth \
+            -C $PWD/artifacts/bootloader-aarch64 kernel-aarch64
+          tar -cvJf alioth-macos-aarch64.tar.xz \
+            -C $PWD/artifacts/alioth-aarch64-apple-darwin alioth \
+            -C $PWD/artifacts/bootloader-aarch64 kernel-aarch64
+      - name: Upload artifact
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: release-artifacts
+          path: alioth-*-*.tar.xz
+      # - name: Create Release
+      #   uses: softprops/action-gh-release@v2
+      #   with:
+      #     files: alioth-*-*.tar.xz
+      #     fail_on_unmatched_files: true