Build multiple Xcode versions during pull request

Author: hannesa2

.github/workflows/BuildPR.yml

@@ -6,16 +6,20 @@ jobs:
   build-objective-git:
     name: Build objective-git
     runs-on: macOS-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode: [Xcode_11.7, Xcode_12.2, Xcode_12.4]
     steps:
       - name: Checkout
         uses: actions/[email protected]
         with:
           fetch-depth: 0
           submodules: true
       - name: Set XCode Version
-        run: sudo xcode-select -s /Applications/Xcode_12.2.app
+        run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app
       - name: Build project
-        run: xcodebuild -workspace ObjectiveGitFramework.xcworkspace -scheme "ObjectiveGit Mac" build | xcpretty
+        run: xcodebuild -workspace ObjectiveGitFramework.xcworkspace -scheme "ObjectiveGit Mac" archive | xcpretty
       - name: Xcodebuild Action
         uses: sersoft-gmbh/[email protected]
         with: