Add installer UKI profile

When using a USB stick to install ParticleOS, users can boot into
this profile to boot into a "live" version of ParticleOS in which
root is a tmpfs, systemd-repart is masked and autologin as root is
enabled.

Author: DaanDeMeyer

mkosi.uki-profiles/live.conf

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[UKIProfile]
+Profile=
+        ID=live
+        TITLE=Live System (Installer)
+
+Cmdline=
+        root=tmpfs
+        rd.systemd.mask=systemd-repart.service
+        systemd.mask=systemd-repart.service
+        systemd.firstboot=no
+        systemd.set-credential=agetty.autologin:root
+        systemd.set-credential=login.noauth:yes