Set modeline for neovim

roles/emacs/templates/emacs.d/init.el.j2

@@ -1,4 +1,5 @@
 ; {{ ansible_managed }}
+; vim: ft=lisp
 
 ; Set garbage collection threshold to 100 Mbyte.
 (setq gc-cons-threshold (* 100 1024 1024))

roles/neovim/files/config/nvim/lua/settings.lua

@@ -57,6 +57,9 @@ opt.termguicolors = true
 
 -- Enable undo persistence.
 opt.undofile = true
+-- Enable modeline, since it uses an allowlist approach since neovim >= 0.5:
+-- https://github.com/neovim/neovim/issues/2865
+opt.modeline = true
 
 -- Use italic for comments.
 cmd [[ autocmd Colorscheme * highlight Comment cterm=italic term=italic gui=italic ]]