ci: Add build and deployment jobs

Author: hacker1024

.github/workflows/build.yaml

@@ -0,0 +1,32 @@
+on:
+  push:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+          flutter-version: 3.24.x
+      - run: flutter build web
+      - id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/web
+  
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4