added +debug variant to ISSM build as pre-release

[justinh2002]

Added a +debug variant to the ISSM Spack recipe. When enabled, the following adjustments are made:

• Compiler flags set to -g -O0 for all supported compilers.
• Debug builds propagate to dependencies where possible.
• Stripped-out optimizstions to prioritise debuggability over performance

---

🚀 The latest prerelease access-issm/pr19-4 at 62c54ac is here: #19 (comment) 🚀

[github-actions]

🚀 Attempted to deploy access-issm Prerelease pr19-1 with commit 62c54ac

🖥️ Gadi Deployment ❌

[github-actions]

🚀 Attempted to deploy access-issm Prerelease pr19-2 with commit 62c54ac

🖥️ Gadi Deployment ❌

[justinh2002]

!redeploy

[justinh2002]

!deploy

[github-actions]

🚀 Attempted to deploy access-issm Prerelease pr19-3 with commit 62c54ac

🖥️ Gadi Deployment ❌

[justinh2002]

!redeploy

[github-actions]

🚀 Attempted to deploy access-issm Prerelease pr19-4 with commit 62c54ac

🖥️ Gadi Deployment ✔️

Usage Instructions

access-issm, defined in ./spack.yaml, will be deployed to Gadi as:

• 2025.06.0 as a Release (when merged).
• pr19-4 as a Prerelease (during this PR).

This Prerelease is accessible on Gadi using:

module use /g/data/vk83/prerelease/modules
module load access-issm/pr19-4

When using the above modules, the binaries shall be on your $PATH.

For advanced users, this Prerelease is also accessible on Gadi via /g/data/vk83/prerelease/apps/spack/0.22/spack in the access-issm-pr19-4 environment.
Due to inode-saving measures, one will have to manually untar the environment metadata before environment activation with tar -xf .spack-env .spack-env.tar. It will require one to have write privileges.

Configuration Information

This Prerelease is deployed using:

• access-nri/spack on branch 0.22
• access-nri/spack-packages version justin/debug
• access-nri/spack-config version 2025.08.000

If the above was not what was expected, commit changes to config/versions.json in this PR.