Hey Florian.
I faced an error in the following:
ssh -p22 Administrator@myserver.com "mkdir -p /html/wp-content/themes/_tmp"
Warning: Permanently added 'myserver.com ' (ECDSA) to the list of known hosts.
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,password).
ERROR: Job failed: exit code 1
I have added the private key in variables but still facing the issue.