Follow these steps:

• Use the nightly Docker image for Lemmy and lemmy-ui
• Setup postgres, pictrs and nginx according to the usual 0.19 instructions
• Specify plugins in Lemmy config (docs, example)
• You need to specify the hash for each wasm file (check logfile for error message), or set DANGER_PLUGIN_SKIP_HASH_CHECK (not merged yet, part of the PR above)

Let me know if this works, then I will add it to the documentation. Or better yet, make a PR yourself ;)

Edit: Config from the test server:

plugins: [{
  file: "https://github.com/LemmyNet/lemmy-plugins/releases/download/0.1.3/rust_lingua.wasm",
  hash: "e1f58029f2ecca5127a4584609494120683b691fc63a543979ea071f32cf690f",
  allowed_hosts: ["0.0.0.0"]
}]