Fix GitHub Pages artifact assembly

Update the Pages workflow to use `$GITHUB_OUTPUT` instead of deprecated `::set-output` when exporting example app data. In the publish job, download artifacts into a dedicated `artifacts` directory, assemble them into a `site/<package>` structure, and upload `site` as the Pages artifact so each example app is deployed under its package path.

Author: guidezpl

.github/workflows/deploy_github_pages.yml

@@ -24,12 +24,12 @@ jobs:
       example-apps: ${{ steps.find-example-apps.outputs.example-apps }}
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      - run: man ls
       - name: Find example apps
         id: find-example-apps
         # Outputs a JSON list of packages with example apps, e.g. ["dynamic_color", ...]
         run: |
-          echo "::set-output name=example-apps::$(ls -d */example | xargs dirname | jq -R -s -c 'split("\n")[:-1]')"
+          example_apps=$(ls -d */example | xargs dirname | jq -R -s -c 'split("\n")[:-1]')
+          echo "example-apps=$example_apps" >> "$GITHUB_OUTPUT"
         working-directory: packages
 
   # Build example web apps job
@@ -68,11 +68,23 @@ jobs:
     steps:
       - name: Download all web builds
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          path: artifacts
+          merge-multiple: false
+
+      - name: Assemble Pages directory structure
+        run: |
+          mkdir -p site
+          for artifact_dir in artifacts/*; do
+            package_name="$(basename "$artifact_dir")"
+            mkdir -p "site/$package_name"
+            cp -R "$artifact_dir"/. "site/$package_name"/
+          done
 
       - name: Upload pages artifact
         uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
         with:
-          path: '.'
+          path: 'site'
 
   # Deploy job
   deploy-pages: