Add artifact upload on build failure

Author: zoobestik

.github/workflows/gradle.yml

@@ -18,4 +18,10 @@ jobs:
       run: chmod +x gradlew
     - name: Build with Gradle
       run: ./gradlew build
-
+    - name: Upload artifact
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: tests
+        path: ${{ github.workspace }}/build/reports/tests/
+        retention-days: 10