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

scripts/test-luarocks-install.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+MODREV=$(git describe --tags --always --first-parent | tr -d "v")
+luarocks install "telescope.nvim" "$MODREV"