Using project.MarshalYAML() with extra_hosts causes invalid output ex. ``` extra_hosts: - host.docker.internal:host-gateway ``` will give ``` extra_hosts: - host.docker.internal=host-gateway ``` which produces an error because docker compose expect the ip after : the fix would be to change = to : in here https://github.com/compose-spec/compose-go/blob/main/types/hostList.go#L43