Transfer snap form launchpad to build.snapcraft.io

Hi.
I maintain the ubuntu-make snap. It’s been set up to build on launchpad since support for classic snaps at the time was not up to par.
Having it on launchpad means that I cannot verify the builds properly…
It now says (on launchpad) that the build is failing, since it is using xenial. Even though the snap has core18.
How can I trigger a rebuild and/or transfer the snap to builds.snapcraft.io?
Thanks

build.snapcraft.io integrates with Github. The easiest way I think would be to put the code in a Github repo and link it with your account on build.snapcraft.io. Then you can trigger builds either manually via the web interface, or upon a commit to the master branch of the repo.

The code is already on github… it’s just being pulled on launchpad to build the snap.
Now the classic snaps build fine on snapcraft.io