Create an installation ISO based on ubuntu server 16.04 to install the privacyIDEA server and Appliance
The process is loosely based on the Install CD Customization documentation and the script by Leigh Purdie.
You need a current point-release of the ubuntu server iso image (16.04.5 as of 2018/09/03). If the image is not locally available, it will be downloaded from the ubuntu servers.
You also need a template machine with a freshly installed pi-appliance to
collect all the updated packages.
The script makes extensive use of sudo to gain root privileges, so make sure it is available
and working. Alternatively the script can be run as root as well.
Some settings must be configured in the build_iso.sh script (i.e. the template server).
Then just run ./build_iso.sh [-i <base iso-file>] <working directory> and if everything works,
an iso-image will be available in the working directory.
Always test the image before shipping it in case some errors crept in during the build.