I took a look at prisma, seems there is no way to install a local cluster without Docker? How could be deploy to an OpenVZ host where Docker is not possible?

At the moment, if it is possible it's not automated nor documented. You'd probably have to look into how the Docker container configuration/the deploy command and essentially duplicate however it's handled. Someone else might be able to provide a better answer though

I’m 99.99% sure Prisma will only run on Docker. It’s very tightly coupled to it from what I know

That's a shame :(