Skip tests in the deployment job

Since we're already run all the tests,
we don't need to test again.
In addition, we do not have PlantUML installed in this job environment, thus, tests would fail.

Author: travkin79

.github/workflows/ci.yml

@@ -62,6 +62,6 @@ jobs:
     - name: Deploy to GitHub Maven Packages
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      run: mvn -B clean -Pdeploy-github deploy
+      run: mvn -B clean -Pdeploy-github -DskipTests deploy