Added Quay link

doc/source/cpn/frontend/index.rst

@@ -10,7 +10,8 @@ You can update the Frontend by following those steps:
 1. Merge the Pull-Request
 2. Tag the desired commit and push the tag to Github. It should be visible afterwards on this page: https://github.com/opentelekomcloud-infra/circle-partner-navigator-frontend/tags
 3. Wait at least 10 minutes
-4. Open a Pull-Request to adjust the kustomization config to the new tag. https://github.com/opentelekomcloud-infra/system-config/blob/main/kubernetes/circle-partner-navigator/base/kustomization.yaml#L16
-5. Merge this Pull-Request and wait 10 minutes.
+4. Check whether your tag has been successfully published to the container repository: https://quay.io/repository/opentelekomcloud/circle-partner-navigator-frontend?tab=tags
+5. Open a Pull-Request to adjust the kustomization config to the new tag. https://github.com/opentelekomcloud-infra/system-config/blob/main/kubernetes/circle-partner-navigator/base/kustomization.yaml#L16
+6. Merge this Pull-Request and wait 10 minutes.
 
 Be aware that updating the Frontend will also pull the data from the Backend again and as a result will also update the partner data on the website.