nixpkgs/neovim: add gitsigns code actions to null-ls

.config/nixpkgs/neovim/lsp.lua

@@ -6,7 +6,9 @@ vim.diagnostic.config({
 local nvim_lsp = require('lspconfig')
 local null_ls = require('null-ls')
 
-local null_ls_sources = {}
+local null_ls_sources = {
+  null_ls.builtins.code_actions.gitsigns,
+}
 
 -- enable LS / null-ls sources based on executable presence
 if vim.fn.executable("node_modules/.bin/eslint") == 1 then