ci: reduce runner costs — Linux-first matrix with targeted cross-platform spot-checks - #435
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harell wants to merge 1 commit into
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ci: reduce runner costs — Linux-first matrix with targeted cross-platform spot-checks#435harell wants to merge 1 commit into
harell wants to merge 1 commit into
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0 New Issues
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No data about coverage (94.70% Estimated after merge)
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@harell this is a bug in your automation - GitHub Actions usage is free on Open Source repos like |
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Context — GitHub Actions cost reduction
The
tonkintaylororganisation is currently spending .46 over its included Actions minutes (as of April 2026). An audit of all 37 org repositories identified this repo as the highest-volume cost contributor, with 93 workflow runs recorded since January 2026.What the current setup costs
The CI matrix runs 2 Python versions × 3 operating systems = 6 cross-platform jobs per push, plus 5 ubuntu-only include jobs — ~11 jobs total per trigger.
GitHub charges hosted runner minutes at:
ubuntu-latestwindows-latestmacos-latestWith 93 runs, 2 macOS jobs per trigger at ~3 min each = ~5,580 Linux-equivalent minutes for macOS alone.
What this changes
["3.10","3.14"]× 3 OS["3.10","3.14"]× Linux onlyThe spot-check jobs set
checks: "false"to skip pre-commit/pyright on Windows/macOS (those checks are already verified on Linux and not meaningful cross-platform).Why this is safe
rastris a published PyPI library — cross-platform validation is genuinely valuable. This change preserves it: a platform-specific packaging, import, or runtime bug in Python 3.14 will still be caught by the spot-checks. Full Python version coverage (3.10–3.14) continues on Linux. The old approach of testing every Python version on every OS provides diminishing returns in exchange for significant cost.No functional changes
No source code, tests, or configuration is modified. This is a CI runner change only.