whisperback: include some system information reported by dmidecode

This was asked some time ago and waiting for an infrastructure
enabling its implementation

config/chroot_local-includes/usr/local/sbin/tails-debugging-info

@@ -12,6 +12,9 @@ debug_file() {
     cat $1
 }
 
+debug_command /usr/sbin/dmidecode -s system-manufacturer
+debug_command /usr/sbin/dmidecode -s system-product-name
+debug_command /usr/sbin/dmidecode -s system-version
 debug_command "/bin/dmesg"
 debug_command "/bin/lsmod"
 debug_command "/usr/bin/lspci"