feat: publish releases to luarocks (#185)

neotest 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).

.github/workflows/luarocks-release.yaml

@@ -0,0 +1,17 @@
+on:
+  release:
+    types: [published]
+
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: LuaRocks Upload
+        uses: nvim-neorocks/luarocks-tag-release@v4
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+    with:
+      dependencies: |
+        plenary.nvim
+        nvim-treesitter

README.md

@@ -27,6 +27,8 @@ See `:h neotest` for details on neotest is designed and how to interact with it
 
 ## Installation
 
+[![LuaRocks](https://img.shields.io/luarocks/v/nvim-neotest/neotest?logo=lua&color=purple)](https://luarocks.org/modules/nvim-neotest/neotest)
+
 Neotest uses [plenary.nvim](https://github.com/nvim-lua/plenary.nvim/).
 
 Most adapters will also require [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter).