ci: add github actions

.github/workflows/deploy.yml

@@ -0,0 +1,32 @@
+name: React CD
+
+on:
+    push:
+        branches: [master]
+    workflow_dispatch:
+
+jobs:
+    deploy:
+        runs-on: ubuntu-latest
+
+        permissions:
+            contents: write
+
+        steps:
+            - name: Check out repo
+              uses: actions/checkout@v2
+
+            - name: Setup Node
+              uses: actions/setup-node@v2
+
+            - name: Install dependencies
+              run: npm install
+
+            - name: Build React
+              run: npm run build
+
+            - name: Deploy to GitHub Pages
+              uses: peaceiris/actions-gh-pages@v3
+              with:
+                  github_token: ${{ secrets.GITHUB_TOKEN }}
+                  publish_dir: ./build