Adds base_dir var for openEuler to generate mirror properly

CHANGELOG.md

@@ -5,6 +5,8 @@ All notable changes to this project will be documented in this file.
 ## [Unreleased]
 
 ## [2.0.41]
+### Added
+- Adds support for openEuler
 
 ## [2.0.40]
 ### Added

roles/netbootxyz/defaults/main.yml

@@ -287,6 +287,7 @@ releases:
     - code_name: nixos-unstable
       name: nixos-unstable
   openEuler:
+    base_dir:
     enabled: true
     menu: linux
     mirror: https://repo.openeuler.org