Guides

The specific problems behind most GitHub Actions bills, with the exact change and how to verify it worked.

• Why your GitHub Actions bill is mostly macOS
  macOS bills at roughly ten times the Linux rate. How to tell whether a job actually needs it, and the exact change if it does not.
• Stop paying for GitHub Actions runs nobody waits for
  Every push to a pull request starts a full run, even when a newer commit has already replaced it. The exact concurrency block that fixes it safely.
• GitHub Actions cache not working: the usual causes
  A cache that never hits is worse than no cache: it costs a cold run every time. The five causes, in the order worth checking.