add check for /etc/resolvconf.conf

[jerzerisz]

add option to diable /etc/resolvconf.conf update

ansible facts /etc/os_release /etc/debian_version don't differentiate debian vrs raspberrypi os, so test if /etc/resolvconf.conf file exists and update if it exists

Fixes #520
tested deploying on debian 11.7 micropc and raspberrypi os 20230214 rpi 4b 4g

[geerlingguy]

Could we instead just have a variable like resolvconf_file_path and let the user override it? So instead of hardcoding /etc/resolvconf.conf, we could have resolvconf_file_path: /etc/resolvconf.conf, and Debian users could set that to resolvconf_file_path: /etc/resolve.conf.

[jerzerisz]

I started with the config to disable it, but then figured out checking if the file exists. And I left that option in because it' was useful to run multiple ad block DNS containers for testing.

I looked into something like that, unfortunately they aren't the same file/format, and are usually externally managed.

on Raspberry pi OS resolvconf regenerates /etc/resolve.conf based on /etc/resolveconf.conf as well as integrate with dnsmasq/pdnsd/unbound and other name services.

On Debian NetworkManager configures /etc/resolv.conf
On Ubuntu systemd-resolved manages it.

Looking at the ansible NetworkManager module: https://docs.ansible.com/ansible/latest/collections/community/general/nmcli_module.html

I don't see a way to just add a DNS server.

[github-actions]

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[github-actions]

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