fix: add if condition to build job

Author: suzuki-shunsuke

.github/workflows/test.yml

@@ -28,6 +28,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     needs: setup
+    if: fromJSON(needs.setup.outputs.services)
     strategy:
       matrix:
         service: ${{fromJSON(needs.setup.outputs.services)}}