validateOS matched only ID from /etc/os-release, so derivatives such as
Omarchy, CachyOS, Manjaro or Linux Mint failed validation before the
Docker checks ran. Check ID first, then each ID_LIKE entry, and keep the
exactly-one-match rule. Move the parsing into a testable function.
Closes#12033
Co-authored-by: Furox <177975472+Furox-Art@users.noreply.github.com>
