Tweak GitHub Actions CI so that pushing the same commit to multiple branch tips at the same time will not waste building and testing the same thing twice. * jc/ci-skip-same-commit: ci: avoid building from the same commit in parallel
Tweak GitHub Actions CI so that pushing the same commit to multiple branch tips at the same time will not waste building and testing the same thing twice. * jc/ci-skip-same-commit: ci: avoid building from the same commit in parallel