Run the global-workflow CI workflow on Gaea

[DavidBurrows-NCO]

Description

What: add Gaea to the global-workflow CI testing workflow

Resolves #2572
Refs /issues/2535

Type of change

• New feature (adds functionality)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

Working with Terry on getting this running.

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
• My changes generate no new warnings
• New and existing tests pass with my changes
• I have made corresponding changes to the documentation if necessary