Add workflow to generate world screenshots and generate GitHub page from it.

.github/workflows/generate_github_pages.yml

@@ -0,0 +1,35 @@
+name: Generate GitHub Pages
+on:
+  workflow_dispatch:
+  schedule:
+    # At 00:00 on every Tuesday UTC
+    - cron: '0 0 * * 2'
+
+jobs:
+  generate-github-pages:
+    runs-on: ubuntu-latest
+    # Skip in forks
+    if: github.repository == 'element-hq/element-x-android'
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin' # See 'Supported distributions' for available options
+          java-version: '17'
+      - name: Configure gradle
+        uses: gradle/actions/setup-gradle@v3
+        with:
+          cache-read-only: ${{ github.ref != 'refs/heads/develop' }}
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.9
+      - name: Run World screenshots generation script
+        run: |
+          ./tools/test/generateWorldScreenshots.py
+      - name: Deploy GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./screenshots