The man page for "gcloud cloud-shell ssh" says that I can specify a specific ssh key to log in. However, in the current CLI, this argument doesn't take a value.
```
--ssh-key-file
The path to the SSH key file. By default, this is
~/.ssh/google_compute_engine.
```
Attempts to use it causes an expected cli failure.
```
$ gcloud cloud-shell ssh --authorize-session --project myproject --ssh-key-file ~/.ssh/id_rsa
ERROR: (gcloud.cloud-shell.ssh) unrecognized arguments: /Users/sandip/.ssh/id_rsa
To search the help text of gcloud commands, run:
gcloud help -- SEARCH_TERMS
```