change image name

Author: dingp

.github/workflows/build-keycloak-image.yaml

@@ -30,7 +30,7 @@ jobs:
         uses: docker/metadata-action@v6
         with:
           images: |
-            ghcr.io/dingp/keycloak-demo
+            ghcr.io/nersc/keycloak-demo
           tags: |
             type=raw,value=latest
             type=ref,event=branch