Add staging pipeline workflow for deployment

Author: tipspay-dev

.github/workflows/staging.yml

@@ -0,0 +1,34 @@
+name: Staging Pipeline
+
+on:
+  push:
+    branches: [ develop ]
+
+jobs:
+  staging-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Compile contracts
+        run: npm run compile
+
+      - name: Run tests
+        run: npm run test
+
+      - name: Deploy to Sepolia Testnet
+        run: npm run deploy:testnet
+
+      - name: Verify contracts
+        run: npm run verify --network sepolia