Deploy additional config files

[powellchristoph]

I would like to add support for additional config files and would like some input before I drop a PR.

Specifically my use case. I would like to add additional audit logging.

• Edit the config.yaml to include: audit-policy-file: /etc/rancher/rke2/audit-policy.yaml

• Create audit-policy.yaml in /etc/rancher/rke2 folder.

Currently, we can easily at the rke2 config file entry, but there is no way to drop the audit file itself. Perhaps manage additional_files in the cloud-init file as the manifests are done?

[remche]

Thanks @powellchristoph for the proposition to add a more generic way to add files. I'm open and happy to accept PR on this and imho it makes sense to use such a mechanism as for manifests files. The only question is should we deprecate manifests_path ans manifests_gzb4 to avoid redundancy ?