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/luarocks-upload.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Expects the LUAROCKS_API_KEY secret to be set
+
+TMP_DIR=$(mktemp -d)
+MODREV=$(git describe --tags --always --first-parent | tr -d "v")
+DEST_ROCKSPEC="$TMP_DIR/telescope.nvim-$MODREV-1.rockspec"
+cp "telescope.nvim-scm-1.rockspec" "$DEST_ROCKSPEC"
+sed -i "s/= 'scm'/= '$MODREV'/g" "$DEST_ROCKSPEC"
+luarocks upload "$DEST_ROCKSPEC" --api-key="$LUAROCKS_API_KEY"