Investigate the etcd folder permission

[clyang82]

logs when you start the controlplane

I0606 10:14:38.833465    2585 options.go:411] the embedded etcd directory: /Users/chuyang/go/src/github.com/clyang82/multicluster-controlplane/_output/controlplane/.ocm
I0606 10:14:38.833512    2585 etcd.go:34] Creating embedded etcd server
{"level":"warn","ts":1686017678.8376708,"caller":"fileutil/fileutil.go:57","msg":"check file permission","error":"directory \"/Users/chuyang/go/src/github.com/clyang82/multicluster-controlplane/_output/controlplane/.ocm\" exist, but the permission is \"drwxr-xr-x\". The recommended permission is \"-rwx------\" to prevent possible unprivileged access to the data"}

/assign @ycyaoxdu