try to fix github cache

[d-chambers]

This PR makes test-data caching deterministic in GitHub Actions.

Previously, DASCore’s test data cache was populated lazily during test execution. Because multiple CI jobs shared the same cache key, whichever job saved first could publish a partial cache. Later jobs would restore
that incomplete cache and still need to download missing files, which made the cache look unreliable.

This change introduces an explicit cache-priming step that downloads the full contents of dascore/data_registry.txt before test jobs run.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 92c83f51-a110-4d91-a517-2121155809fd

📥 Commits

Reviewing files that changed from the base of the PR and between 5de00c6 and 3221bb9.

📒 Files selected for processing (8)

• .github/actions/cache-test-data/action.yml
• .github/scripts/cache_test_data.py
• .github/workflows/get_coverage.yml
• .github/workflows/prime_test_data_cache.yml
• .github/workflows/profile.yml
• .github/workflows/run_min_dep_tests.yml
• .github/workflows/runtests.yml
• .github/workflows/test_doc_build.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix_test_cache

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[d-chambers]

superseded by #620