Run build tests with the Demo variant

Author: tunjid

.github/workflows/Build.yaml

@@ -90,7 +90,7 @@ jobs:
           disable-animations: true
           disk-size: 6000M
           heap-size: 600M
-          script: ./gradlew connectedProdDebugAndroidTest -x :benchmark:connectedProdBenchmarkAndroidTest
+          script: ./gradlew connectedDemoDebugAndroidTest -x :benchmark:connectedDemoBenchmarkAndroidTest
 
       - name: Upload test reports
         if: always()