Add failing script to install firefox

roles/fai/templates/srv/fai/config/scripts/04-snaps

@@ -1,15 +1,18 @@
 #!/bin/bash
 
+### FAILS: snapd is not running during FAI
+
 if [ "${#SNAPS[*]}" -eq 0 ]; then
         SNAPS=( firefox )
 fi
 
 function package_exists() {
-        return dpkg -l "$1" &> /dev/null
+	$ROOTCMD dpkg -l "$1" &> /dev/null
+        return $?
 }
 
-for SNAP in $SNAPS; do
-        if ! package_exists "snapd"; then
-                snap install "$SNAP"
+for SNAP in "${SNAPS[@]}"; do
+        if package_exists "snapd"; then
+                $ROOTCMD snap install "$SNAP"
         fi
 done