Create main.yml for azure deployment

.github/workflows/main.yml

@@ -0,0 +1,36 @@
+name: CI/CD Pipeline for Azure Deployment
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20.x"
+
+      - name: Change directory to express_backend
+        run: cd express_backend
+
+      - name: Install dependencies
+        run: npm install
+        working-directory: express_backend
+
+      - name: Deploy to Azure Web App
+        uses: azure/webapps-deploy@v2
+        with:
+          app-name: Pathfiller-web-app
+          publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
+          package: express_backend