build(ci): add dedicated macos-arm64 preview build workflow

.github/workflows/release.yml

@@ -21,6 +21,7 @@ on:
         options:
           - all
           - windows-x64
+          - macos-arm64
 
 permissions:
   contents: write # needed to create / update the GitHub Release
@@ -29,6 +30,7 @@ jobs:
   build:
     if: >-
       github.ref != 'refs/heads/build/windows-x64' &&
+      github.ref != 'refs/heads/build/macos-arm64' &&
       (github.event_name != 'workflow_dispatch' || inputs.platform == 'all')
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
@@ -338,6 +340,122 @@ jobs:
           if-no-files-found: error
           retention-days: 14
 
+  build-macos-arm64:
+    if: >-
+      github.ref == 'refs/heads/build/macos-arm64' ||
+      (github.event_name == 'workflow_dispatch' && inputs.platform == 'macos-arm64')
+    name: macos-arm64
+    runs-on: macos-14
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: aarch64-apple-darwin
+
+      - name: Cache cargo build
+        uses: Swatinem/rust-cache@v2
+        with:
+          key: aarch64-apple-darwin
+
+      - name: Build (release)
+        run: cargo build --release --target aarch64-apple-darwin
+
+      - name: Set package metadata
+        shell: bash
+        run: |
+          set -euo pipefail
+          VERSION="$(sed -n 's/^version = "\([^"]*\)"/\1/p' Cargo.toml | head -n 1)"
+          if [ -z "$VERSION" ]; then
+            echo "Unable to read the package version from Cargo.toml" >&2
+            exit 1
+          fi
+          PACKAGE_VERSION="${VERSION}-dev.${GITHUB_SHA:0:7}"
+          echo "VERSION=$VERSION" >> "$GITHUB_ENV"
+          echo "PACKAGE_VERSION=$PACKAGE_VERSION" >> "$GITHUB_ENV"
+          echo "PACKAGE_BASENAME=ashell-v${PACKAGE_VERSION}-macos-arm64" >> "$GITHUB_ENV"
+
+      - name: Package macOS app, DMG, and portable archive
+        shell: bash
+        run: |
+          set -euo pipefail
+          APP_ROOT="$RUNNER_TEMP/${PACKAGE_BASENAME}-app"
+          DMG_ROOT="$RUNNER_TEMP/${PACKAGE_BASENAME}-dmg"
+          APP="$APP_ROOT/ashell.app"
+          CONTENTS="$APP/Contents"
+
+          mkdir -p "$CONTENTS/MacOS" "$CONTENTS/Resources" "$DMG_ROOT" dist
+          cp "target/aarch64-apple-darwin/release/ashell" "$CONTENTS/MacOS/ashell"
+          chmod 755 "$CONTENTS/MacOS/ashell"
+          cp "assets/icons/ashell.icns" "$CONTENTS/Resources/ashell.icns"
+
+          cat > "$CONTENTS/Info.plist" <<EOF
+          <?xml version="1.0" encoding="UTF-8"?>
+          <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
+            "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+          <plist version="1.0">
+          <dict>
+            <key>CFBundleDevelopmentRegion</key>
+            <string>en</string>
+            <key>CFBundleExecutable</key>
+            <string>ashell</string>
+            <key>CFBundleIconFile</key>
+            <string>ashell.icns</string>
+            <key>CFBundleIdentifier</key>
+            <string>dev.ashell.app</string>
+            <key>CFBundleInfoDictionaryVersion</key>
+            <string>6.0</string>
+            <key>CFBundleName</key>
+            <string>ashell</string>
+            <key>CFBundlePackageType</key>
+            <string>APPL</string>
+            <key>CFBundleShortVersionString</key>
+            <string>${VERSION}</string>
+            <key>CFBundleVersion</key>
+            <string>${GITHUB_RUN_NUMBER}</string>
+            <key>LSMinimumSystemVersion</key>
+            <string>12.0</string>
+            <key>NSHighResolutionCapable</key>
+            <true/>
+          </dict>
+          </plist>
+          EOF
+
+          printf 'APPL????' > "$CONTENTS/PkgInfo"
+          plutil -lint "$CONTENTS/Info.plist"
+
+          codesign --force --deep --sign - "$APP"
+          codesign --verify --deep --strict --verbose=2 "$APP"
+
+          ditto -c -k --sequesterRsrc --keepParent \
+            "$APP" "dist/${PACKAGE_BASENAME}-portable.zip"
+          ditto "$APP" "$DMG_ROOT/ashell.app"
+          ln -s /Applications "$DMG_ROOT/Applications"
+          hdiutil create \
+            -volname "ashell ${VERSION}" \
+            -srcfolder "$DMG_ROOT" \
+            -ov \
+            -format UDZO \
+            "dist/${PACKAGE_BASENAME}.dmg"
+
+          EXPECTED_ARCH="arm64"
+          ACTUAL_ARCHS="$(lipo -archs "$CONTENTS/MacOS/ashell")"
+          if [ "$ACTUAL_ARCHS" != "$EXPECTED_ARCH" ]; then
+            echo "Expected $EXPECTED_ARCH binary, found $ACTUAL_ARCHS" >&2
+            exit 1
+          fi
+
+          shasum -a 256 dist/*
+
+      - name: Upload workflow artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: macos-arm64
+          path: dist/*
+          if-no-files-found: error
+          retention-days: 14
+
   publish:
     name: Publish Release
     needs: build