This task updates an existing Homebrew formula to point to the latest source
archive for this package. It's enabled by calling pkg.addHomebrewTasks().
The Homebrew task treats the package's Homebrew repository as the source of
truth for all configuration and metadata. This means that it's the user's
responsibility to set up a reasonable installation formula (Dart Sass's
formula is a good starting point). All this task does is update the formula's
url and sha256 fields to the appropriate values for the latest version.
This task assumes that the package is published on GitHub (specifically to
pkg.githubRepo), and that the task is running in a clone of that GitHub
repo.
Uses configuration: pkg.version, pkg.humanName, pkg.botName,
pkg.botEmail, pkg.githubRepo, pkg.githubUser,
pkg.githubPassword, pkg.homebrewRepo, pkg.homebrewFormula,
pkg.homebrewTag, pkg.homebrewCreateVersionedFormula
Checks out pkg.homebrewRepo and pushes a commit updating
pkg.homebrewFormula's url and sha256 fields to point to the
appropriate values for pkg.version.