Comment out the image build trigger as it doesn't work correctly

Comment out the image build trigger as it doesn't work correctly and causing damage on deployment workflow.

Author: sgyuris

.github/workflows/nmc-trigger-gitlab-image-build.yml

@@ -19,7 +19,7 @@ jobs:
       env:
         GITLAB_TOKEN: ${{ secrets.GITLAB_IMAGE_TRIGGER_TOKEN }}
       run: |
-        curl -X POST \
+        echo curl -X POST \
             --fail \
             -F token=$GITLAB_TOKEN \
             -F ref=master \