Package / Actions Cleanup - Continuation of #435

[simmsa]

This is a continuation and refinement of #435

Highlights:

From #435

• Actions version updates:
  • checkout - v4 to v6
  • setup-python - v2 to v6
• cdip fixes

Dependencies

Module Dependencies

• Pin pandas below version 3.0
  • There are some subtle bugs related to underlying pandas changes that we should address and possibly fix that are out of scope of this PR.
• Refactor dependencies to move xarray, netcdf, and h5 dependencies into all
  • This helps standardize the versions for all modules, and behind the scenes xarray typically requires both netcdf and h5.

Conda and Conda-Forge Dependency Definitions

• Move conda forge environment file into environment-dev.yml and create new conda-forge-build job to test the conda-forge specific no deps build

Actions

Linting

• Add filter to only run black on files that have changed
  • Intent is to reduce noise in the tests. It is a non goal to have all files share the same formatting, we are just trying to enforce formatting on new or changed code
• Add Development Installation section to readme detailing pip, conda, and conda forge installation pathways

Coveralls

• Pin coveralls action at v2
• Adds a switch at the top of main.yml to toggle reporting coveralls upload failures as test failures. Coveralls failures are of the 500 variant, Error: Bad response: 530 error code: 1016 per: https://status.coveralls.io/ and this implements the recommended fail-on-error: false fix

Update - Outage will be extended for at least several more hours. To avoid further disruption to your CI workflows, we recommend employing the fail-on-error: false input option available with all official coveralls integrations. See: https://docs.coveralls.io/integrations#official-integrations.
Feb 24, 2026 - 19:28 PST

We can incorporate this into #435 if that makes sense. My main goal here is to understand what changes are necessary in #435

[simmsa]

@akeeste and @jmcvey3 this is ready.

Do any of you have a preference if we add this to #435 or keep this as a separate PR? Happy to do whatever makes sense.

There are lots of small test/action errors, warnings, and nits that this fixes.

Also coveralls is still down: https://status.coveralls.io/. This adds a flag to ignore coveralls upload errors but that has the potential to lead to false positives (tests fail, but old passing test badges are shown to the user).