feat: add rockspec + luarocks upload workflow (#2276)

telescope.nvim is a common dependency across Neovim plugins.
Using luarocks may alleviate the need for users to specify their
plugins' dependencies in their plugin manager.
(e.g., vim-plug or packer).

See also:
https://teto.github.io/posts/2021-09-17-neovim-plugin-luarocks.html

(cherry picked from commit e8c01bab91)

Makefile

@@ -6,3 +6,9 @@ lint:
 
 docgen:
 	nvim --headless --noplugin -u scripts/minimal_init.vim -c "luafile ./scripts/gendocs.lua" -c 'qa'
+
+luarocks_upload:
+	bash ./scripts/luarocks-upload.sh
+
+test_luarocks_install:
+	bash ./scripts/test-luarocks-install.sh