fix GIT_DISCOVERY_ACROSS_FILESYSTEM error from solargraph (#1232)

lua/default-config.lua

@@ -928,6 +928,16 @@ lvim.lang = {
         on_attach = common_on_attach,
         on_init = common_on_init,
         capabilities = common_capabilities,
+        filetypes = { "ruby" },
+        init_options = {
+          formatting = true,
+        },
+        root_dir = require("lspconfig").util.root_pattern("Gemfile", ".git"),
+        settings = {
+          solargraph = {
+            diagnostics = true,
+          },
+        },
       },
     },
   },