fix: update cluster registration endpoint in installation workflow

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

Author: SkySingh04

.github/workflows/installation-chart.yaml

@@ -139,7 +139,7 @@ jobs:
 
       - name: Register cluster
         run: |
-          karmadactl register ${{ steps.token.outputs.endpoint }} \
+          karmadactl register https://172.18.0.2:6443 \
             --token ${{ steps.token.outputs.token }} \
             --discovery-token-ca-cert-hash ${{ steps.token.outputs.hash }} \
             --kubeconfig $HOME/.kube/karmada.config