Remember to change: username & authorized_keys and no password, then it only the pc with the corect ssh key that have access, you can have more keys.
username: hassio
password: ""
authorized_keys:
- >-
ssh-ed25519
asdspaaspdadsasdasdfasdfasdfasdfafsdf/
abekat@gmail.com
- >-
ssh-ed25519
asdspaasdasdhjkghghjghjjghjkgukfafsdf/
hunkat@gmail.com
sftp: false
compatibility_mode: false
allow_agent_forwarding: false
allow_remote_port_forwarding: false
allow_tcp_forwarding: false