Fix GitHub actions test script

Author: danielepantaleone

.github/workflows/swift-tests.yml

@@ -46,5 +46,14 @@ jobs:
         uses: actions/checkout@v4
       - name: Build
         run: swift build
-      - name: Run tests
-        run: swift test
+      - name: Select latest Xcode
+        run: |
+          LATEST_XCODE=$(ls /Applications | grep '^Xcode_' | sort -V | tail -n1)
+          echo "Using $LATEST_XCODE"
+          sudo xcode-select -s "/Applications/$LATEST_XCODE"
+      - name: Run tests with xcodebuild
+        run: |
+          xcodebuild test \
+            -scheme BlueConnect \
+            -sdk macosx \
+            -destination 'platform=macOS'