[packer] auto expose Port for docker packer:light container

[janlauber]

Dear hashicorp team
Is there a way to autoexpose the packerport onto the Dockerhost for Provisioning the user-data / meta-data file via http out of the docker network?
Would be awesome, because currently I'm using the packer:light image as a gitlab runner and so the packer http server only exposes itself in the docker network for prov the user-data / meta-data stuff.
Would be nice if you implement this or show me a valid workaround.