Reads a local secret key from disk. The location of this file can be
specified in the USER_KEY environment variable.
If this environment variable does not exist, then attempts to read the
key from:
~/.ssh/id_rsa, and
~/.ssh/id_rsa.pem.
local_key()The location of the key is defined by:
Sys.getenv("USER_KEY")
To use a local in a different location, set an environment variable:
Sys.setenv(USER_KEY = "path/to/private/key")
Other secret functions: add_secret,
delete_secret, get_secret,
list_owners, list_secrets,
share_secret, unshare_secret,
update_secret