LSP working for Elm

backend/src/langs.ts

@@ -331,6 +331,8 @@ void main() {
     repl: "elm repl",
     main: "Main.elm",
     run: "cp /opt/elm/elm.json elm.json && run-elm Main.elm; elm repl",
+    lsp: "elm-language-server --stdio",
+    lspSetup: "cp /opt/elm/elm.json elm.json",
     template: `module Main exposing (..)
 
 output : String

scripts/docker-install-phase4.bash

@@ -41,6 +41,7 @@ npm install -g coffeescript
 
 # Elm
 npm install -g @kachkaev/run-elm
+npm install -g @elm-tooling/elm-language-server
 
 # FORTRAN
 pip3 install fortran-language-server