Additionally to the variable SSH_PRIVATE_KEY, which can be used to
reference a private key saved as a string within a variable (the previous
documentation falsely stated, that it references a path and has been
adjusted), the new variable SSH_PRIVATE_KEY_FILE can now be used to reference
the path to a file containing the private key.
Signed-off-by: Jasper Orschulko <jasper@fancydomain.eu>
[Jan: Fix logic for detecting set env vars]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
15de0142d4