fix(ci): cpp env var

Author: benlubas

.github/workflows/luarocks.yml

@@ -2,8 +2,9 @@ name: Push to Luarocks
 
 on:
   push:
-    branches:
-      - main
+    tags: # Will upload to luarocks.org when a tag is pushed
+      - "*"
+  pull_request: # Will test a local install without uploading to luarocks.org
 
 jobs:
   luarocks-upload:
@@ -27,6 +28,7 @@ jobs:
         uses: nvim-neorocks/luarocks-tag-release@v7
         env:
           LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}
+          CXX: "clang++"
         with:
           version: ${{ env.LUAROCKS_VERSION }}
           dependencies: |