attempt to add joliet long names

iso/empanadas/empanadas/templates/xorriso.tmpl.txt

@@ -1,6 +1,8 @@
 -indev {{ boot_iso }}
 -outdev {{ isoname }}
 -boot_image any replay
+-joliet
+-compliance joliet_long_names
 -volid {{ volid }}
 {{ graft }}
 -end

iso/empanadas/empanadas/util/shared.py

@@ -833,7 +833,13 @@ class Shared:
             isokwargs["input_charset"] = None
 
         if opts['use_xorrisofs']:
-            cmd = ['/usr/bin/xorriso', '-dialog', 'on', '<', opts['graft_points']]
+            cmd = [
+                    '/usr/bin/xorriso',
+                    '-dialog',
+                    'on',
+                    '<',
+                    opts['graft_points']
+            ]
         else:
             cmd = Shared.get_mkisofs_cmd(
                     opts['iso_name'],