Drop builder image in OBS

This commit drops the builder image in OBS and adds xorriso and mtools
to the requirements of elemental-cli.

This allows using the OS image to build the ISO from itself.

Signed-off-by: David Cassany <[email protected]>

Author: davidcassany

.obs/dockerfile/Dockerfile

@@ -34,8 +34,8 @@ Requires:       parted
 Requires:       rsync
 Requires:       udev
 Requires:       xfsprogs
-
-Recommends:     xorriso
+Requires:       xorriso
+Requires:       mtools
 
 %if 0%{?suse_version}
 BuildRequires:  golang(API) >= 1.18