ci: Switch to branch-less GitHub pages workflow

Author: jplatte

.github/workflows/documentation.yml

@@ -9,6 +9,11 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
 jobs:
   docs:
     name: All crates
@@ -61,10 +66,13 @@ jobs:
           mv target/doc/* doc/
           mv bindings/matrix-sdk-crypto-js/docs/* doc/bindings/matrix-sdk-crypto-js/
 
-      - name: Deploy documentation
+      - name: Upload artifact
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        uses: peaceiris/actions-gh-pages@v3
+        uses: actions/upload-pages-artifact@v1
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./doc/
-          force_orphan: true
+          path: './doc/'
+
+      - name: Deploy to GitHub Pages
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        id: deployment
+        uses: actions/deploy-pages@v2