Add GitHub Actions workflow with PR preview support

Author: noobnooc

.github/workflows/deploy.yml

@@ -0,0 +1,59 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      deployments: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+        env:
+          NODE_ENV: production
+
+      - name: Deploy to Cloudflare (Preview for PR / Production for main)
+        uses: cloudflare/wrangler-action@v3
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          command: |
+            if [ "${{ github.event_name }}" = "pull_request" ]; then
+              # Deploy to preview with unique name based on PR number
+              opennextjs-cloudflare build
+              wrangler deploy --env preview --name sparkmemos-pr-${{ github.event.pull_request.number }}
+            else
+              # Deploy to production
+              opennextjs-cloudflare deploy
+            fi
+
+      - name: Deploy status comment
+        if: github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const previewUrl = `https://sparkmemos-pr-${{ github.event.pull_request.number }}.workers.dev`;
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.payload.pull_request.number,
+              body: `🚀 Preview deployed: ${previewUrl}`
+            });