It is not ready for prime-time yet. So, don't try this at home. But here it is:

curl -fsSL https://deno.land/x/install/install.sh | sudo DENO_INSTALL=/usr/local sh

deno run -A https://gitlab.com/soapbox-pub/ditto/-/raw/main/src/server.ts

That's really it is to get it running.