Lmod / Environment Modules support

[adolago]

Summary

Implement modules for Lmod (or classic Environment Modules) installation and configuration.

Modules

lmod_install

• Install from distro packages (preferred) or from tarball
• Handle distro differences (Rocky vs Ubuntu package names)

modulespath_config

• Manage /etc/profile.d/ scripts for module initialization
• Configure module search paths (MODULEPATH)
• Support site-specific module hierarchies

Examples

• Example modulefiles for GCC and OpenMPI (simple templated modulefile generation)
• Example /opt/modules/ directory structure

Target

Enable users to module load gcc/12.3 and module load openmpi/4.1 on any compute node.