Fix snapshot directory permission

[michalskalski]

Missing executable bit for owner of snapshot directory prevented
creating snapshot files.

{"level":"error","ts":"2022-07-21T13:21:38.612Z","caller":"etcd/server.go:490","msg":"failed to snapshot","error":"failed to save snapshot: open /var/lib/snapshots/etcd-2_0000000000000009_etcd.backup3390438042: permission denied","stacktrace":"github.com/quentin-m/etcd-cloud-operator/pkg/etcd.(*Server).runSnapshotter\n\texternal/etcd_cloud_operator/pkg/etcd/server.go:490"}
{"level":"error","ts":"2022-07-21T13:21:38.613Z","caller":"etcd/server.go:291","msg":"failed to write etcd snapshot out [written bytes: 0]","error":"meta 0 copy: io: read/write on closed pipe","stacktrace":"github.com/quentin-m/etcd-cloud-operator/pkg/etcd.(*Server).snapshot.func1\n\texternal/etcd_cloud_operator/pkg/etcd/server.go:291"}

ubuntu@ubuntu:~$ kubectl exec -it etcd-2 -- ls -l /var/lib/
total 0
drwx------ 3 1000 3000 20 Jul 21 13:16 etcd
drw------- 2 1000 3000  6 Jul 21 13:16 snapshots

with change proposed in commit:

{"level":"info","ts":"2022-07-21T13:47:12.388Z","caller":"etcd/server.go:241","msg":"snapshot \"etcd-2_0000000000000009_etcd.backup\" saved successfully in 3.360749ms (0.02 MB)"}

ubuntu@ubuntu:~$ kubectl exec etcd-2 -- ls -l /var/lib/
total 0
drwx------ 3 1000 3000 20 Jul 21 13:42 etcd
drwx------ 2 1000 3000 58 Jul 21 13:47 snapshots

[Quentin-M]

Weird I’ve never seen that, but no big deal - thanks.