ci: add github pages deploy job

.github/workflows/build.yml

@@ -62,3 +62,28 @@ jobs:
       run: |
         yarn install
         yarn build
+    - name: Push to Github Pages
+      if: github.ref == 'refs/heads/master' || github.event_name == 'workflow_dispatch'
+      uses: actions/upload-pages-artifact@v1
+      with:
+        path: './dist'
+
+  deploy:
+    needs: build
+    if: github.ref == 'refs/heads/master' || github.event_name == 'workflow_dispatch'
+
+    # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+
+    # Allow one concurrent deployment
+    concurrency:
+      group: "pages"
+      cancel-in-progress: true
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        uses: actions/deploy-pages@v1