[jubianchi]

Summary

This adds a Homebrew cask to this repository, so the app can be installed with:

brew tap dev-null-sh/devnull https://github.com/dev-null-sh/mac-os-app
brew install --cask dev-null-sh/devnull/devnull

The repository works as its own tap, so no separate homebrew-tap repository is needed.

Changes

• Casks/devnull.rb: the cask, which installs DevNull.app from https://dev-null.sh/downloads/DevNull.dmg.
  • version :latest and sha256 :no_check: the DMG URL has no version in it, so a pinned checksum would break installs after every release until someone updated the cask. Once installed, the app updates itself.
  • depends_on macos: :sonoma, matching LSMinimumSystemVersion.
  • zap removes the app's preferences, caches, HTTP storage and saved state.
• .github/workflows/cask.yml: runs brew style and brew audit --strict --online on the cask when it changes.
• README.md: explains how to install the app, from the DMG or with Homebrew.

Notes

• name is DevNull because Homebrew's linter rejects the /dev/null string, and RuboCop disable comments aren't allowed in casks.
• auto_updates true would fit the app, but Homebrew's audit rejects it for version :latest casks.
• Later, a versioned DMG URL (for example /downloads/DevNull-0.4.0.dmg) would allow a pinned version and checksum, auto_updates true, and a submission to the official homebrew/cask repository.

Testing

• brew style and brew audit --cask --strict --online pass, run locally from a tap of this branch.
• brew install --cask puts DevNull.app 0.4.0 in /Applications, and the signature verifies. brew uninstall --cask removes it.