• https://github.com/Homebrew/brew/issues/1670
• https://github.com/xianyi/OpenBLAS/blob/v0.3.13/.github/workflows/nightly-Homebrew-build.yml
• https://stackoverflow.com/questions/63672189/use-github-actions-cache-with-brew-install

No cleanup: HOMEBREW_NO_INSTALL_CLEANUP

• https://www.scivision.dev/macos-ci-homebrew-disable-cleanup/

Homebrew tap with bottles uploaded to GitHub Releases — Homebrew

Set HOMEBREW_GITHUB_API_TOKEN: ${{ github.token }} when in GitHub Actions. See: https://github.com/Homebrew/homebrew-cask-drivers/blob/master/.github/workflows/ci.yml, https://gist.github.com/christopheranderton/8644743.