No authorization via SSH on standalone GitLab app 14.8

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I can’t get working ssh authorization via ssh using private-public pair keys. I can’t clone repository from another server

** gitlab app: standalone 14.8, hosted on ubuntu 20.04 LTS, using Docker
** git repo host (planned): rasbian on Raspberry Pi 4

Steps taken:

  1. generated private-piublic keys pair using ssh-keygen (rsa) in rasbian
  2. copied public key content
  3. pasted public key in gitlab app - preferences - SSH keys and saved in ubuntu
  4. tried to clone repo in rasbian ussing git ssh adress
  5. got propt to give a password: “git@gitlab.my.host.live’s password:”

I checked some tutorials on that and it seems I do things as expected.

Any help?