Description

In several situations we need to have systemd-resolved installed and configured or we loose DNS. This happens in case of HA and most likely OMV too. As per documentation:

systemd-resolved will work out of the box with a network manager using /etc/resolv.conf. No particular configuration is required since systemd-resolved will be detected by following the /etc/resolv.conf symlink. This is going to be the case with systemd-networkd, NetworkManager, and iwd.

• move DNS server set from Ubuntu specifics
• change switch to if and check for DISTRIBUTION instead of RELEASE
• detach bullseye so we can keep it operational without systemd-resolved
• change bullseye to EOS
• Install systemd-resolved by default to all variants

Jira reference number AR-1657

How Has This Been Tested?

• [x] Made few images

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings

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