CI update to shell environment with HOMEgfs to HOME_GFS for systems that need the path

[TerrenceMcGuinness-NOAA]

Description

This PR is setting a shell environment variable HOME_GFS to point to the path HOMEgfs for systems that need to setup the runtime environment in their respective .bashrc files.

For example:

# Added for Global Workflow
if [ -n "${HOME_GFS}"]; then
    export MODULE_GWSETUP_PATH="${HOME_GFS}/modulefiles"
    module use "${MODULE_GWSETUP_PATH}"
    module load "module_gwsetup.gaea"
fi

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)
• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO

How has this been tested?

This PR itself will be ran on Gaea directly when $HOMEgfs/workflow/gw_setup.sh script for loading the runtime modules is operable on that system.

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• I have made corresponding changes to the system documentation if necessary