Update build process

Author: Jacek Gębal

.github/workflows/build.yml

@@ -68,6 +68,7 @@ jobs:
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
 
       - name: Maven deploy snapshot
+        if: github.event_name != 'pull_request'
         run: mvn deploy -DskipTests
         env:
           MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}