added plugins

lua/custom/configs/null-ls.lua

@@ -0,0 +1,14 @@
+local null_ls = require 'null-ls'
+
+local opts = {
+  sources = {
+    -- python tool
+    null_ls.builtins.formatting.black,
+    null_ls.builtins.diagnostics.mypy,
+    null_ls.builtins.diagnostics.ruff,
+    -- go tools
+    null_ls.builtins.formatting.gofmt,
+    null_ls.builtins.formatting.goimports_reviser,
+    null_ls.builtins.formatting.golines,
+  },
+}