bitdynamics-ab/canton-devkit: docs/homebrew.md

# Homebrew install `canton-devkit` ships a Homebrew formula for macOS (Apple Silicon) and Linux (x86_64). The formula lives in the dedicated tap repository [`bitdynamics-ab/homebrew-canton-devkit`](https://github.com/bitdynamics-ab/homebrew-canton-devkit), following the standard Homebrew tap layout.