[gnome-software/1479-repositories-settings-optional-repos-can-t-be-disabled] settings: Add 'required-repos' key

[Milan Crha <mcrha src gnome org>]

commit df5f58b05f53591559f41a6b3b2484309935bad6
Author: Milan Crha <mcrha redhat com>
Date:   Tue Oct 5 11:43:21 2021 +0200

    settings: Add 'required-repos' key
    
    To be used to list repositories, which cannot be removed or disabled.
    It's a complementary option for the 'official-repos' key.

 data/org.gnome.software.gschema.xml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/data/org.gnome.software.gschema.xml b/data/org.gnome.software.gschema.xml
index db1c27ce4..0e5706b7c 100644
--- a/data/org.gnome.software.gschema.xml
+++ b/data/org.gnome.software.gschema.xml
@@ -94,6 +94,10 @@
       <default>[]</default>
       <summary>A list of official repositories that should not be considered 3rd party</summary>
     </key>
+    <key name="required-repos" type="as">
+      <default>[]</default>
+      <summary>A list of required repositories that cannot be disabled or removed</summary>
+    </key>
     <key name="free-repos" type="as">
       <default>[]</default>
       <summary>A list of official repositories that should be considered free software</summary>