ci: reduce runner costs — Linux-first matrix with targeted cross-platform spot-checks#25
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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#25harell wants to merge 1 commit into
harell wants to merge 1 commit into
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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 a cost contributor.What the current setup costs
The CI matrix runs 3 operating systems × 4 Python versions = 12 jobs per push plus a min-deps run — 13 jobs total per trigger.
GitHub charges hosted runner minutes at:
ubuntu-latestwindows-latestmacos-latestWith 14 workflow runs recorded since January 2026, each run with 4 macOS jobs (~3 min each) accounts for the equivalent of ~30 Linux minutes per run — ~1,700 Linux-equivalent minutes for macOS alone in this period.
What this changes
Spot-check jobs skip
checks(pre-commit, pyright, zizmor) which are Linux-only tools — tests are the only useful cross-platform signal.Why this is safe
geopins-pythonis a published PyPI library, so some cross-platform validation is warranted. However, any OS-specific packaging or import bug will surface on the spot-check against the latest Python. Full Python version sweeps are preserved on Linux.No functional changes
No source code, tests, or configuration is modified. This is a CI runner change only.