Add ability to input docker-compose.yaml via stdin

Signed-off-by: Artho Pacini <[email protected]>

podman_compose.py

@@ -2051,7 +2051,7 @@ def _init_global_parser(parser):
         parser.add_argument(
             "-f",
             "--file",
-            help="Specify an alternate compose file (default: docker-compose.yml) or '-' for reading from stdin.",
+            help="Specify an compose file (default: docker-compose.yml) or '-' to read from stdin.",
             metavar="file",
             action="append",
             default=[],