How to make iso with my deb package

I want to make iso with our own deb package(e.g. jctest.deb).
As documents said:

Building an ISO with any customized package is in no way different then building a regular (customized or not) ISO image. Simply place your modified *.deb package inside the packages folder within vyos-build. The build process will then pickup your custom package and integrate it into your ISO.

I place jctest.deb in vyos-build/packages/ and then make iso.

However, jctest is not included in vyos—xx—.iso.

What should I do to make iso with my own deb package?

I may guess that the package had a wrong name, so it was ignored. Use the dpkg-name tool to rename it properly before build.

It works
Thanks a lot!