Hi @dsaez, welcome to the balena community. Can you give me a bit more info on which project you are pushing or how your Dockerfile is set up? It looks like your code is missing systemd in the container which is why you get that error.
That being said, i know there is some work on improving the balena + screenly project, so I would encourage you to checkout this forum post Help Please - trying to push Screenly-ose to raspberry pi3 via Balena cloud