chore: Run monitor API test at 9am every day

.github/workflows/monitor_api_integration_test.yml

@@ -0,0 +1,51 @@
+name: integration-tests
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # 1pm UTC (9am EDT, 8am EST), every day
+    - cron: "0 13 * * *"
+
+jobs:
+  integration-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Node 18
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: Cache Node modules
+        id: cache-node-modules
+        uses: actions/cache@v3
+        with:
+          path: "**/node_modules"
+          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
+
+      - name: Test getting recommended monitors
+        env:
+          DD_API_KEY: ${{ secrets.DD_API_KEY }}
+          DD_APP_KEY: ${{ secrets.DD_APP_KEY }}
+        run: npm run test:integration
+
+  notify:
+    runs-on: ubuntu-latest
+    needs: integration-tests
+    steps:
+      - name: Send failure message to Slack
+        env:
+          SLACK_CHANNEL: "#serverless-onboarding-and-enablement-ops"
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+        if: failure()
+        run: |
+          set -x
+          OPS_MESSAGE=":gh-check-passed: Serverless Plugin failed to fetch recommended monitors from monitor API!
+          Please check GitHub Action log: https://github.com/DataDog/serverless-plugin-datadog/actions/workflows/monitor_api_integration_test.yml"
+          curl -H "Content-type: application/json" -X POST "$SLACK_WEBHOOK" -d '{
+          "channel": "'"$SLACK_CHANNEL"'",
+          "text": "'"$OPS_MESSAGE"'"