Revert "Removed executing xvfb-run on docs-qthelp target due to compilation error."

This reverts commit acfcbe88

.gitlab-ci.yml

@@ -58,7 +58,7 @@ compile:
     - cmake --build . --target SystemTestData
     - cmake --build . --target AllTests
     - xvfb-run cmake --build . --target docs-html
-    - cmake --build . --target docs-qthelp
+    - xvfb-run cmake --build . --target docs-qthelp
     - cmake --build . --target package
 
   artifacts: