Creating a Galaxy Tool that can be executed on Frontier

This is a "How to" about steps needed to create a Apptainer(former Singularity)-based tool for Galaxy. It is recommended to read documentation about Docker-based first, since in this section we mainly describe extra steps

There are three steps involved:

1. Prepare an Apptainer image with executable(s)
2. Create an XML file for the tool
3. Add the tool to Galaxy configuration - same as for a generic tool