exec is always interactive

TODO

 - colors
 - "shc CONTAINER start" vs. "shc CONTAINER shell"
-- exec -i
 
 Albireo cleanup:
 - prerouting rule

shipcat/main.py

@@ -262,9 +262,9 @@ def cmd_shell(args: argparse.Namespace) -> None:
 def cmd_exec(args: argparse.Namespace) -> None:
     cc = setup_container(args, False)
 
-    cmd = ['podman', 'exec']
+    cmd = ['podman', 'exec', '--interactive']
     if args.tty is not None:
-        cmd.extend(['--interactive', '--tty'])
+        cmd.append('--tty')
     if args.user is not None:
         cmd.extend(['--user', args.user])
     cmd.append(cc.container)