Missing unzip command

Signed-off-by: Marco Marinello <me@marcomarinello.it>
2 jobs for buster in 13 minutes and 34 seconds (queued for 20 seconds)
Status Job ID Name Coverage
  Clonezilla
passed rebuild-squashfs #99

00:04:20

 
  Packaging
passed build-buster #100

00:09:14