Add GitHub Actions workflow for running Postman API contract tests

Author: AminaSaoudi

.github/workflows/postman-tests.yml

@@ -0,0 +1,36 @@
+name: API Contract Tests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  run-postman-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install Newman
+        run: npm install -g newman newman-reporter-htmlextra
+
+      - name: Run Postman tests
+        run: |
+          newman run postman/JSONPlaceholder_Collection.json \
+            -e postman/Development_Environment.json \
+            -r cli,htmlextra \
+            --reporter-htmlextra-export newman-report.html
+
+      - name: Upload Newman HTML Report
+        uses: actions/upload-artifact@v4
+        with:
+          name: newman-report
+          path: newman-report.html