add demo with github pages... (refs #41)

Author: mborne

.github/workflows/demo-pages.yml

@@ -31,6 +31,9 @@ jobs:
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress
 
+    - name: Configure authentication for composer
+      run: git config --global github.accesstoken $GITHUB_TOKEN
+
     - name: Build demo
       run: bash .ci/build-demo.sh
       env: