fix param name

Signed-off-by: Alex Meijer <alexander.meijer@ibm.com>

.github/workflows/promote-to-demo.yaml

@@ -38,5 +38,5 @@ jobs:
     uses: opencost/opencost-infra/.github/workflows/promote-to-oc-demo.yaml@atm/cd-to-demo
     secrets: inherit
     with:
-      image-tag: ${{ needs.prep-image-name.outputs.image_tag }}
+      img-fqdn: ${{ needs.prep-image-name.outputs.image_tag }}
       is_be: true