hardcode ghcr image name

Signed-off-by: mahdikhashan <[email protected]>

Author: mahdikhashan

.github/workflows/mpi-operator-docker-image-publish.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           images: |
             ${{ env.IMAGE_NAME }}
-            ghcr.io/${{ env.IMAGE_NAME }}
+            ghcr.io/kubeflow/mpi-operator/controller
           tags: |
             type=ref,event=branch
             type=ref,event=pr