Add build process for Darwin binaries in PR workflow

.github/workflows/pr-build.yml

@@ -72,4 +72,42 @@ jobs:
         with:
           name: agent-${{matrix.architecture}}.tar
           path: agent-${{matrix.architecture}}.tar
+          
+  build-darwin:
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: write
+    strategy:
+      matrix:
+        architecture: [amd64, arm64]
+    steps:
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Checkout
+        uses: actions/checkout@v3
+      - uses: benjlevesque/short-sha@v2.1
+        id: short-sha
+        with:
+          length: 7
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Build Darwin binary with Docker
+        run: |
+          docker build -f Dockerfile.cross \
+            --build-arg GOOS=darwin \
+            --build-arg GOARCH=${{matrix.architecture}} \
+            -t darwin-${{matrix.architecture}} .
+          CID=$(docker create darwin-${{matrix.architecture}})
+          docker cp ${CID}:/home/agent ./output-${{matrix.architecture}}
+          docker rm ${CID}
+      - name: Tar Darwin binary and clean
+        run: tar -cf agent-darwin-${{matrix.architecture}}.tar -C output-${{matrix.architecture}} . && rm -rf output-${{matrix.architecture}}
+      - name: Upload darwin artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: agent-darwin-${{matrix.architecture}}.tar
+          path: agent-darwin-${{matrix.architecture}}.tar