fix: set container name to manager to ensure we wait for it (#975)

**What problem does this PR solve?**:
changes name of container to manager to ensure a clusterctl waits for
this core service caren depends on to be ready.

**Which issue(s) this PR fixes**:
Fixes #

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Author: faiq

charts/cluster-api-runtime-extensions-nutanix/templates/helm-repository.yaml

@@ -69,7 +69,7 @@ spec:
         - name: charts-volume
           mountPath: "/helm-charts"
       containers:
-      - name: helm-repository
+      - name: manager
         ports:
           - name: serve
             protocol: TCP