Unknown ssh-ed25519 host key

[Spikeedoo]

I get the following message when I try to deploy to remote docker host from self-hosted runner. Private and public key are populated by GitHub action secrets. The private key is the id_rsa from the remote docker host. I have tried populating public key with various lines/parts of lines from known_hosts. I.e. 192.168.1.112 ecdsa-sha2-nistp256 <key> or 192.168.1.112 ssh-ed25519 <key> etc. Every time I run the action I get the following (replaced key bytes with my placeholder in brackets):

2022-06-27T17:56:26.3700370Z Registering SSH keys...
2022-06-27T17:56:26.5729539Z Agent pid 10
2022-06-27T17:56:26.6566995Z Identity added: /github/home/.ssh/id_rsa (/github/home/.ssh/id_rsa)
2022-06-27T17:56:26.6588114Z Add known hosts
2022-06-27T17:56:26.6623663Z Connecting to root@192.168.1.112... Command: docker-compose  --log-level debug --host ssh://root@192.168.1.112:22 -f docker-compose.yml -p asthtc-web up -d
2022-06-27T17:56:32.5626526Z Using configuration files: ./docker-compose.yml
2022-06-27T17:56:32.5929219Z Trying paths: ['/github/home/.docker/config.json', '/github/home/.dockercfg']
2022-06-27T17:56:32.5933239Z No config file found
2022-06-27T17:56:32.5937681Z Trying paths: ['/github/home/.docker/config.json', '/github/home/.dockercfg']
2022-06-27T17:56:32.5941265Z No config file found
2022-06-27T17:56:32.7181556Z /usr/lib/python3.8/site-packages/paramiko/client.py:835: UserWarning: Unknown ssh-ed25519 host key for 192.168.1.112: b'[insert key bytes here]'
2022-06-27T17:56:32.7184836Z   warnings.warn(
2022-06-27T17:56:32.7317323Z Traceback (most recent call last):
2022-06-27T17:56:32.7320669Z   File "/usr/bin/docker-compose", line 11, in <module>
2022-06-27T17:56:32.7324196Z     load_entry_point('docker-compose==1.25.4', 'console_scripts', 'docker-compose')()
2022-06-27T17:56:32.7330388Z   File "/usr/lib/python3.8/site-packages/compose/cli/main.py", line 72, in main
2022-06-27T17:56:32.7333360Z     command()
2022-06-27T17:56:32.7564384Z   File "/usr/lib/python3.8/site-packages/compose/cli/main.py", line 125, in perform_command
2022-06-27T17:56:32.7576151Z     project = project_from_options('.', options)
2022-06-27T17:56:32.7578681Z   File "/usr/lib/python3.8/site-packages/compose/cli/command.py", line 54, in project_from_options
2022-06-27T17:56:32.7580469Z     return get_project(
2022-06-27T17:56:32.7583639Z   File "/usr/lib/python3.8/site-packages/compose/cli/command.py", line 147, in get_project
2022-06-27T17:56:32.7585544Z     client = get_client(
2022-06-27T17:56:32.7588030Z   File "/usr/lib/python3.8/site-packages/compose/cli/command.py", line 118, in get_client
2022-06-27T17:56:32.7589785Z     client = docker_client(
2022-06-27T17:56:32.7591914Z   File "/usr/lib/python3.8/site-packages/compose/cli/docker_client.py", line 127, in docker_client
2022-06-27T17:56:32.7593728Z     client = APIClient(**kwargs)
2022-06-27T17:56:32.7595756Z   File "/usr/lib/python3.8/site-packages/docker/api/client.py", line 165, in __init__
2022-06-27T17:56:32.7598178Z     self._custom_adapter = SSHHTTPAdapter(
2022-06-27T17:56:32.7600496Z   File "/usr/lib/python3.8/site-packages/docker/transport/sshconn.py", line 111, in __init__
2022-06-27T17:56:32.7602193Z     self._connect()
2022-06-27T17:56:32.7604219Z   File "/usr/lib/python3.8/site-packages/docker/transport/sshconn.py", line 119, in _connect
2022-06-27T17:56:32.7606083Z     self.ssh_client.connect(**self.ssh_params)
2022-06-27T17:56:32.7608204Z   File "/usr/lib/python3.8/site-packages/paramiko/client.py", line 435, in connect
2022-06-27T17:56:32.7609839Z     self._auth(
2022-06-27T17:56:32.7611729Z   File "/usr/lib/python3.8/site-packages/paramiko/client.py", line 764, in _auth
2022-06-27T17:56:32.7613405Z     raise saved_exception
2022-06-27T17:56:32.7617909Z   File "/usr/lib/python3.8/site-packages/paramiko/client.py", line 740, in _auth
2022-06-27T17:56:32.7619752Z     self._transport.auth_publickey(username, key)
2022-06-27T17:56:32.7622048Z   File "/usr/lib/python3.8/site-packages/paramiko/transport.py", line 1580, in auth_publickey
2022-06-27T17:56:32.7623952Z     return self.auth_handler.wait_for_response(my_event)
2022-06-27T17:56:32.7626646Z   File "/usr/lib/python3.8/site-packages/paramiko/auth_handler.py", line 250, in wait_for_response
2022-06-27T17:56:32.7628390Z     raise e
2022-06-27T17:56:32.7629952Z paramiko.ssh_exception.AuthenticationException: Authentication failed.

What am I doing wrong?