Add support for runtime service configuration key

https://docs.docker.com/compose/compose-file/05-services/#runtime

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>

podman_compose.py

@@ -983,6 +983,8 @@ async def container_to_args(compose, cnt, detached=True):
     platform = cnt.get("platform", None)
     if platform is not None:
         podman_args.extend(["--platform", platform])
+    if cnt.get("runtime", None):
+        podman_args.extend(["--runtime", cnt["runtime"]])
 
     # WIP: healthchecks are still work in progress
     healthcheck = cnt.get("healthcheck", None) or {}