Fix build playground (#281)

Author: aspeddro

.github/workflows/gh-pages.yml

@@ -19,21 +19,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v4
         with:
           node-version-file: .nvmrc
 
       # Instruct a C++ compiler to use the C++20 standard
+      # Required to install tree-sitter dev dependencie
       # See # https://github.com/tree-sitter/node-tree-sitter/issues/268
-      - name: Set env var for C++ compiler
-        shell: bash
-        run: export CXXFLAGS="-std=c++20"
-
       - name: Install dependencies
-        run: npm ci
+        run: CXXFLAGS="-std=c++20" npm ci
 
       - name: Build WASM
         run: npx tree-sitter build --wasm