fix: add macOS system dependency installation step in build workflow

Author: vncloudsco

.github/workflows/build.yml

@@ -37,6 +37,11 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
 
+      - name: Install system dependencies (macOS only)
+        if: startsWith(matrix.platform, 'macos')
+        run: |
+          brew install create-dmg
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with: