Contents in this directory are used for the generation of apptainer images using the ApptainerGenerator script found in MOOSE at scripts/apptainer_generator.py.

In particular:

• app_envrionment: Appends to the environment in the container to add NEKRS_HOME
• app_post_post_install: Copies the cross section download script for use in testing
• app_post_pre_make: Sets extra variables for the build and builds the extra dependencies (nekrs, openmc, dagmc) before the main build so that the MAKEFLAGS variable can be set for parallel builds.
• app_test_begin: Downloads the cross sections for testing