LSP working for Bash

Another easy one!

backend/src/langs.ts

@@ -82,6 +82,7 @@ implement main0 () = ()
     repl: "bash --rcfile /dev/null",
     main: "main.bash",
     run: "bash --rcfile main.bash",
+    lsp: "bash-language-server start",
     template: `echo "Hello, world!"
 `,
   },

scripts/docker-install-phase4.bash

@@ -26,6 +26,9 @@ for file in /opt/rust/bin/*; do
     ln -s /opt/rust/wrapper /usr/bin/${file##*/}
 done
 
+# Bash
+npm install -g bash-language-server
+
 # Befunge
 npm install -g befunge93 prompt-sync