ci: fix pipeline for multi-service Gradle build

Author: MarkADom

.github/workflows/ci.yml

@@ -24,11 +24,20 @@ jobs:
           java-version: 21
           cache: gradle
 
-      - name: Grant execute permission for Gradle
-        run: chmod +x ./gradlew
-
-      - name: Build project
-        run: ./gradlew build
-
-      - name: Run tests
-        run: ./gradlew test
+      - name: Build order-service
+        run: |
+          cd services/order-service
+          chmod +x gradlew
+          ./gradlew build
+
+      - name: Build tracking-service
+        run: |
+          cd services/tracking-service
+          chmod +x gradlew
+          ./gradlew build
+
+      - name: Build notification-service
+        run: |
+          cd services/notification-service
+          chmod +x gradlew
+          ./gradlew build