fix: etcd install fail

[daviderli614]

gtctl version: v0.1.0-beta.3
kind kubernetes version: 1.27.3

When running gtctl locally, The following error message appears:

./gtctl cluster create mycluster

Creating GreptimeDB cluster 'mycluster' in namespace 'default' ...
  ✓ Installing greptimedb-operator successfully 🎉
  ✗ Installing etcd cluster failed 😵‍💫
Error: error while applying helm chart: the server could not find the requested resource
error while applying helm chart: the server could not find the requested resource

Run ./gtctl cluster create mycluster -v=5 and observe the PodDisruptionBudget yaml file the resource apiVersion is policy/v1beta1, but the policy/v1beta1 API version of PodDisruptionBudget is no longer served as of k8s v1.25. We should use the policy/v1 version of apiVersion.

By getting the kubernetes version, inject to helm client, can run gtctl successfully:

./bin/gtctl cluster create mycluster
Creating GreptimeDB cluster 'mycluster' in namespace 'default' ...
  ✓ Installing greptimedb-operator successfully 🎉
  ✓ Installing etcd cluster successfully 🎉
  ✓ Installing GreptimeDB cluster successfully 🎉

Now you can use the following commands to access the GreptimeDB cluster:

MySQL >
$ kubectl port-forward svc/mycluster-frontend -n default 4002:4002 > connections-mysql.out &
$ mysql -h 127.0.0.1 -P 4002

PostgreSQL>
$ kubectl port-forward svc/mycluster-frontend -n default 4003:4003 > connections-pg.out &
$ psql -h 127.0.0.1 -p 4003

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[killme2008]

LGTM