Add batch install script and updated source / binary mirror files for EPIC Tier 1 hosts

[rickgrubin-noaa]

Description

Add a batch install script for EPIC Tier 1 hosts, and update mirrors.yaml files for those hosts to define source and binary cache locations.

File util/epic/intel_oneapi-2026.0.0_install.sh is added for potential future need / use.

Both scripts shamelessly borrowed from NRL host scripts.

Dependencies

None

Issues addressed

None

Applications affected

None

Systems affected

• derecho
• gaea-c6
• hercules
• orion
• ursa

Note: ParallelWorks / CSP hosts not (yet) implemented

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • Multiple build / install runs across all EPIC Tier1 hosts

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged