Add ci job to check Xcode compatibility

Author: kateinoigakukun

.github/workflows/test.yml

@@ -26,3 +26,12 @@ jobs:
           SWIFT_VERSION=${{ matrix.toolchain }} make bootstrap
           echo ${{ matrix.toolchain }} > .swift-version
           make test
+  native-build:
+    # Check native build to make it easy to develop applications by Xcode
+    name: Build for native target
+    runs-on: macos-11
+    steps:
+      - uses: actions/checkout@v2
+      - run: swift build
+        env:
+          DEVELOPER_DIR: /Applications/Xcode_13.2.1.app/Contents/Developer/