ci: add release workflow to publish new tags to LuaRocks (#1431)

Co-authored-by: hrsh7th <629908+hrsh7th@users.noreply.github.com>

.github/workflows/release.yaml

@@ -0,0 +1,19 @@
+name: "release"
+on:
+  push:
+    tags:
+      - 'v*'
+jobs:
+  luarocks-upload:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: LuaRocks Upload
+        uses: nvim-neorocks/luarocks-tag-release@v3
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+        with:
+          detailed_description: |
+            A completion engine plugin for neovim written in Lua.
+            Completion sources are installed from external repositories and "sourced".
+