Version of the secret (version number or the string
'latest'). It is preferable to use ``latest`` version with
secret volumes as secret value changes are reflected
Relative path of the file under the mount path where the
secret value for this version will be fetched and made
available. For example, setting the mount_path as
'/etc/secrets' and path as ``secret_foo`` would mount the
secret value file at ``/etc/secrets/secret_foo``.