fix: add helm repo before dependency build in cluster-test

Author: ServerSideHannes

.github/workflows/cluster-test.yml

@@ -120,7 +120,10 @@ jobs:
           kubectl wait --for=condition=ready pod -l app=redis -n s3proxy --timeout=120s
 
       - name: Build Helm dependencies
-        run: helm dependency build manifests/
+        run: |
+          helm repo add dandydeveloper https://dandydeveloper.github.io/charts
+          helm repo update
+          helm dependency build manifests/
 
       - name: Install s3proxy chart
         run: |