Use different artifact names for all matrix builds

Author: yongce

.github/workflows/ci.yml

@@ -41,5 +41,5 @@ jobs:
       uses: actions/upload-artifact@v2
       if: failure()
       with:
-        name: androidTest-results
+        name: androidTest-results-${{ matrix.api-level }}-${{ matrix.target }}
         path: build/androidTest-results