Add WCRP compliance check pipeline using cc-plugin-wcrp

[Copilot]

Describe your changes

Adds a GitHub Actions workflow (wcrp_compliance_check.yml) that runs cc-plugin-wcrp WCRP compliance checks against all NetCDF outputs generated by the test suite.

Key changes

• Workflow (wcrp_compliance_check.yml): New CI pipeline that runs on PRs and workflow_dispatch. Uses the repository's environment.yaml for conda dependencies. Runs all output-generating tests in a single pytest invocation, gathers the CMOR outputs, then validates them with compliance-checker --test=wcrp_cmip6.
• Gather script (gather_test_outputs.sh): Reusable script that collects NetCDF test outputs from hardcoded output directories and the pytest --basetemp directory, categorizes them as CMIP6 or CMIP7, and skips uncategorized files (e.g. statics) that are not expected to be compliant.

Pipeline structure

1. Test execution (most fragile step, runs first): All four output-generating test files run in a single pytest invocation with --basetemp=tmp/pytest_basetemp to preserve temporary artifacts:
   • test_cmor_run_subtool.py — outputs to fremorizer/tests/test_files/outdir
   • test_cmor_run_subtool_further_examples.py — outputs to fremorizer/tests/test_files/outdir_ppan_only
   • test_cmor_yamler_subtool.py::test_cmor_yaml_subtool_dry_run_false — outputs to basetemp
   • test_cli.py — outputs to basetemp (CMIP6 and CMIP7 run cases)
2. Output gathering: Gather script collects and categorizes all CMOR outputs (14 files: 12 CMIP6, 2 CMIP7), skipping non-compliant statics files.
3. cc-plugin-wcrp install (deferred behind file_count gate): Only installed if outputs were gathered.
4. Compliance checks: Runs wcrp_cmip6 checks on CMIP6 and CMIP7 outputs, generating text and JSON reports.
5. Artifacts: Uploads test outputs and compliance reports.

Bug fixes

• Fixed bash set -e + ((var++)) from 0 arithmetic gotcha in gather_test_outputs.sh — replaced with var=$((var + 1)).
• Single pytest invocation prevents --basetemp from being wiped between separate pytest calls.

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main      #67   +/-   ##
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  Coverage   93.78%   93.78%           
=======================================
  Files           9        9           
  Lines        1206     1206           
=======================================
  Hits         1131     1131           
  Misses         75       75           

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[ilaflott]

make sure all the testing outputs are being collected, see comments

[Copilot]

make sure all the testing outputs are being collected, see comments

All addressed in e3d729d — now collecting outputs from all four test files (run_subtool, further_examples, yamler dry_run_false, CLI). 14 total CMOR outputs gathered (12 CMIP6, 2 CMIP7), 2 non-compliant files skipped.

[ilaflott]

awyiss