update validate all

.github/workflows/validate-all.yml

@@ -57,6 +57,11 @@ jobs:
     with:
       package-name: pnap_payments_api
       test-file: pnap_payments_api_test.py
+  build-and-test-billingapi:
+    uses: ./.github/workflows/_common.yml
+    with:
+      package-name: pnap_billing_api
+      test-file: pnap_billing_api_test.py
 
   run-generic-tests:
     uses: ./.github/workflows/_test.yml
@@ -79,6 +84,7 @@ jobs:
       - build-and-test-locationapi
       - build-and-test-invoicingapi
       - build-and-test-paymentsapi
+      - build-and-test-billingapi
       - run-generic-tests
     runs-on: ubuntu-20.04
     if: always()