[FEAT] Run on Kubernetes with config map for ddclient.conf file

[marleixo]

Is this a new feature request?

• I have searched the existing issues

Wanted change

I'm moving my stuff to Kubernetes and while moving this I don't want to have to create a volume for it but only creating a configmap, it's a configuration file and it makes sense to be a configmap instead of giving it a volume only for a config file.

Reason for change

it's a configuration file and it makes sense to be a configmap instead of giving it a volume only for a config file.
I tried doing it, but it's trying to change the owner of the file some some reason

chown: changing ownership of '/config/ddclient.conf': Read-only file system
**** Permissions could not be set. This is probably because your volume mounts are remote or read-only. ****
**** The app may not work properly and we will not provide support for it. ****
chmod: changing permissions of '/config/ddclient.conf': Read-only file system
s6-rc: warning: unable to start service init-ddclient-config: command exited 1

Proposed code change

No response

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