workflow: Add mtools

Signed-off-by: Loïc Minier <loic.minier@oss.qualcomm.com>

Author: lool

.github/workflows/debos.yml

@@ -52,7 +52,9 @@ jobs:
           apt update
           apt -y upgrade
           apt -y full-upgrade
-          apt -y install debos
+          # debos is needed to build recipes, mtools is needed for the flash
+          # recipe
+          apt -y install debos mtools
 
       - name: Build debos recipe
         run: |