add ruby formatter and lsp

packages/opencode/src/lsp/language.ts

@@ -63,6 +63,14 @@ export const LANGUAGE_EXTENSIONS: Record<string, string> = {
   ".cshtml": "razor",
   ".razor": "razor",
   ".rb": "ruby",
+  ".rake": "ruby",
+  ".gemspec": "ruby",
+  ".ru": "ruby",
+  ".erb": "erb",
+  ".html.erb": "erb",
+  ".js.erb": "erb",
+  ".css.erb": "erb",
+  ".json.erb": "erb",
   ".rs": "rust",
   ".scss": "scss",
   ".sass": "sass",