WARNING: UNPROTECTED PRIVATE KEY FILE!

[trinity-geology-unstable]

Hi,

I am getting this error message in the logs of this container. It appears to be preventing any SSH access. For the past 4 weeks it was running fine until this message appeared without any input from me. Can somebody help?

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@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
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Permissions 0660 for '/etc/ssh/ssh_host_ed25519_key' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.

I have the container running with Portainer on TrueNAS Scale. SSH key is supplied using a BORG_AUTHORIZED_KEYS environment value.