Update .drone.yml

.drone.yml

@@ -3,6 +3,12 @@ name: sonarcube
 type: docker
 
 steps:
+  - name: unity-build-tests
+    image: docker.io/library/unity-test-runner:0.1
+    commands:
+      - /opt/unity/editors/2021.3.19f1/Editor/Unity -batchmode -nographics -projectPath . -executeMethod UnityEditor.SyncVS.SyncSolution | true
+
+
   - name: code-analysis
     pull: if-not-exists
     image: mcr.microsoft.com/dotnet/sdk:6.0