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

.github/workflows/release.yml

@@ -0,0 +1,22 @@
+name: "release"
+on:
+  push:
+    tags:
+      - '*'
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: leafo/gh-actions-lua@v9
+        with:
+          luaVersion: "luajit-2.1.0-beta3"
+      - uses: leafo/gh-actions-luarocks@v4
+      - name: Install dkjson
+        run: luarocks install dkjson
+      - name: Luarocks Upload
+        env: 
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+        run: make luarocks_upload
+      - name: Install release
+        run: make test_luarocks_install