Create Secret component allows saving SSH key without trailing newline

[willhaines]

If you create an SSH key secret by pasting the contents without an empty line at the end, then git clone will fail to authenticate.

Simply adding an empty line to the secret contents fixes the problem. IMHO, this would probably be best fixed upstream in SSH, however there is precedent in other projects to simply work around this behaviour by making sure SSH private keys end with a newline character:

jenkinsci/ssh-credentials-plugin#33
semaphoreui/semaphore#183