Fix formatting of description of systemd command

When running "podman-compose", the list of commands gets displayed.
The "systemd" command is an outlier, showing multiple lines, unintended
at this location.

This change moves the longer command description to its proper place,
that is, it gets shown when "podman-compose systemd --help" is
executed.

Signed-off-by: Cleber Rosa <crosa@redhat.com
Signed-off-by: Monika Kairaityte <monika@kibit.lt>

Author: clebergnu

podman_compose.py

@@ -2469,7 +2469,7 @@ def _parse_args(self, argv: list[str] | None = None) -> argparse.Namespace:
         subparsers = parser.add_subparsers(title="command", dest="command")
         _ = subparsers.add_parser("help", help="show help")
         for cmd_name, cmd in self.commands.items():
-            subparser = subparsers.add_parser(cmd_name, help=cmd.desc)  # pylint: disable=protected-access
+            subparser = subparsers.add_parser(cmd_name, help=cmd.help, description=cmd.desc)  # pylint: disable=protected-access
             for cmd_parser in cmd._parse_args:  # pylint: disable=protected-access
                 cmd_parser(subparser)
         self.global_args = parser.parse_args(argv)
@@ -2604,7 +2604,12 @@ def wrapped(*args: Any, **kw: Any) -> Any:
             raise PodmanComposeError("Command must be async")
         wrapped._compose = self.compose  # type: ignore[attr-defined]
         # Trim extra indentation at start of multiline docstrings.
-        wrapped.desc = self.cmd_desc or re.sub(r"^\s+", "", func.__doc__ or "")  # type: ignore[attr-defined]
+        help_desc = self.cmd_desc or re.sub(r"^\s+", "", func.__doc__ or "")  # type: ignore[attr-defined]
+        if "\n" in help_desc:
+            wrapped.help, wrapped.desc = help_desc.split("\n", 1)  # type: ignore[attr-defined]
+        else:
+            wrapped.help = help_desc  # type: ignore[attr-defined]
+            wrapped.desc = None  # type: ignore[attr-defined]
         wrapped._parse_args = []  # type: ignore[attr-defined]
         self.compose.commands[self.cmd_name] = wrapped
         return wrapped