ci: add luarocks workflow

Author: bekaboo

.github/workflows/luarocks.yml

@@ -0,0 +1,18 @@
+name: push-to-luarocks
+
+on:
+  push:
+    tags: # Will upload to luarocks.org when a tag is pushed
+      - "*"
+  pull_request: # Will test a local install without uploading to luarocks.org
+  workflow_dispatch:
+
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: LuaRocks Upload
+        uses: nvim-neorocks/luarocks-tag-release@v5
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}