fix: second attempt

Author: RobPasMue

.github/workflows/ci_cd.yml

@@ -20,7 +20,6 @@ env:
   RESET_IMAGE_CACHE: 5
   IS_WORKFLOW_RUNNING: True
   ARTIFACTORY_VERSION: v252
-  VTK_DEFAULT_OPENGL_WINDOW: "vtkOSOpenGLRenderWindow"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -443,6 +442,7 @@ jobs:
           python-version: ${{ env.MAIN_PYTHON_VERSION }}
           checkout: false
           randomize: true
+          requires-xvfb: true
 
       - name: Upload integration test logs
         if: always()
@@ -813,6 +813,7 @@ jobs:
           pytest-extra-args: "--use-existing-service=yes"
           checkout: false
           randomize: true
+          requires-xvfb: true
 
       - name: "Compressing Linux Dockerfile"
         uses: vimtor/action-zip@1379ea20d4c5705669ba81fd626dd01b1c738f26 # v1.2