fix(ci): add build step for platform packages in API v2 breaking changes check (#26948)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.github/workflows/check-api-v2-breaking-changes.yml

@@ -39,6 +39,16 @@ jobs:
       - uses: ./.github/actions/cache-checkout
       - uses: ./.github/actions/yarn-install
 
+      - name: Build platform packages
+        run: |
+          yarn turbo run build \
+            --filter=@calcom/platform-constants \
+            --filter=@calcom/platform-enums \
+            --filter=@calcom/platform-utils \
+            --filter=@calcom/platform-types \
+            --filter=@calcom/platform-libraries \
+            --filter=@calcom/trpc
+
       - name: Generate Swagger
         working-directory: apps/api/v2
         run: |