Mount teleport-tls to the init container for the teleport-cluster helm chart (#7166)

Co-authored-by: Gus Luxton <gus@goteleport.com>

examples/chart/teleport-cluster/templates/deployment.yaml

@@ -87,6 +87,11 @@ spec:
         - mountPath: /etc/teleport-secrets
           name: "gcp-credentials"
           readOnly: true
+  {{- end }}
+  {{- if .Values.highAvailability.certManager.enabled }}
+        - mountPath: /etc/teleport-tls
+          name: "teleport-tls"
+          readOnly: true
   {{- end }}
         - mountPath: /etc/teleport
           name: "config"