Use official GitHub Actions for live viewer deployment

.github/workflows/build.yml

@@ -1,11 +1,9 @@
 name: Build
 on:
   pull_request:
-    branches:
-    - main
+    branches: [main]
   push:
-    branches:
-    - main
+    branches: [main]
 jobs:
   build:
     name: Lint and tests
@@ -25,19 +23,3 @@ jobs:
     - run: npm ci
     - run: npm run lint
     - run: npm test
-  deploy:
-    name: Live viewer
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
-    - run: npm ci
-    - name: Build Live Viewer
-      run: bash scripts/deploy-live-viewer.sh
-    - name: Push to gh-pages
-      if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main'  }}
-      uses: peaceiris/actions-gh-pages@v3
-      with:
-        github_token: ${{ secrets.GITHUB_TOKEN }}
-        publish_dir: ./out

.github/workflows/deploy.yml

@@ -0,0 +1,39 @@
+name: Live Viewer
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+      - run: npm ci
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v3
+      - name: Build into _site
+        run: bash scripts/deploy-live-viewer.sh
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v2
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2

.gitignore

@@ -12,3 +12,4 @@ lib/Function.js
 lib/URL.js
 lib/URLSearchParams.js
 lib/utils.js
+_site/

scripts/deploy-live-viewer.sh

@@ -6,5 +6,5 @@ cd "$(dirname "$0")"
 
 npm run build-live-viewer
 
-mkdir -p ../out
-cp -r ../live-viewer/* ../out # exclude files starting with . by using /*
+mkdir -p ../_site
+cp -r ../live-viewer/* ../_site # exclude files starting with . by using /*