feat: support luarocks/rocks.nvim (#128)

Hey 👋 

### Summary

This PR is part of a push to get neovim plugins on
[LuaRocks](https://luarocks.org/labels/neovim).

See also:

- [rocks.nvim](https://github.com/nvim-neorocks/rocks.nvim), a new
luarocks-based plugin manager.
- [this blog
post](https://mrcjkb.github.io/posts/2023-01-10-luarocks-tag-release.html).

### Things done:

- Add a workflow that publishes tags to luarocks.org when a tag or
release is pushed.

### Notes:

> [!IMPORTANT]
> 
> - **For the luarocks workflow to work, someone with a luarocks.org
account will have to add their [API
key](https://luarocks.org/settings/api-keys) to this repo's [GitHub
actions
secrets](https://docs.github.com/en/actions/security-guides/encrypted-secrets#creating-encrypted-secrets-for-a-repository)**.

- Tagged releases are installed locally and then published to
luarocks.org.
- If you push tags from a local checkout, the workflow is triggered
automatically.
- If you use GitHub releases to create tags, you may need to [add a PA
token](https://github.com/nvim-neorocks/sample-luarocks-plugin?tab=readme-ov-file#generating-a-pat-personal-access-token)
for the workflow to be triggered automatically.
- Due to a shortcoming in LuaRocks
(luarocks/luarocks-site#188), the `neovim`
and/or `vim` labels have to be added to the LuaRocks package manually
(after the first upload), for this plugin to show up in
https://luarocks.org/labels/neovim or https://luarocks.org/labels/vim,
respectively.

See also [this guide](https://github.com/vhyrro/sample-luarocks-plugin).

Co-authored-by: Ricardo Casía <[email protected]>

.github/workflows/luarocks.yml

@@ -0,0 +1,46 @@
+---
+name: Push to Luarocks
+
+on:
+  push:
+    tags:
+      - '*'
+  release:
+    types:
+      - created
+    tags:
+      - '*'
+  pull_request: # Tests installing the generated rockspec on PR without uploading
+  workflow_dispatch:
+
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # Required to count the commits
+      - name: Get Version
+        run: echo "LUAROCKS_VERSION=$(git describe --abbrev=0 --tags)" >> $GITHUB_ENV
+
+      # Needed to install the tree-sitter parser dependency
+      - name: Install C/C++ Compiler
+        uses: rlalik/setup-cpp-compiler@master
+        with:
+          compiler: clang-latest
+      - name: Install tree-sitter CLI
+        uses: baptiste0928/cargo-install@v3
+        with:
+          crate: tree-sitter-cli
+
+      - name: LuaRocks Upload
+        uses: nvim-neorocks/luarocks-tag-release@v7
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+        with:
+          version: ${{ env.LUAROCKS_VERSION }}
+          dependencies: |
+            neotest
+            plenary.nvim
+            nvim-nio
+            tree-sitter-java