docs: Mention Format=none in sysext doc

This allows disabling building of the default image as requested in #3113.
systemd · Oct 9, 2024 · 77e13b3 · 77e13b3
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commit 77e13b3
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diff --git a/docs/sysext.md b/docs/sysext.md
@@ -93,3 +93,5 @@ BaseTrees=%O/base
 
 If we now run `mkosi -f` again, we'll find `initrd.cpio.zst` in
 `mkosi.output` with its accompanying extension still in `btrfs.raw`.
+If you don't have any need for a main image, you can configure
+`Format=none` in the `Output` section in `mkosi.conf` to disable it.