You need to have a Debian-based machine (Ubuntu works) for this to work. This is based on https://wiki.debian.org/SettingUpSignedAptRepositoryWithReprepro
Install the reprepro package:
$ sudo apt-get install reprepro
Make sure you have the private GPG key to be allowed to sign.
Now make the repo:
$ ./build.sh
This will download any deb file for Ceylon unless already present in the current folder
and create a Debian repo in dist and pool.
If you don't want to copy pool over the network and already have the deb files where you
want to deploy your repo, just run the makepool.sh script:
$ ./makepool.sh *.deb
That will create a pool directory structure for you.