Add Homebrew tap formula for envguard

[BLemine]

Summary

This PR adds a Homebrew tap repository with a formula for installing envguard, a lightweight CLI tool for validating .env files.

Changes

• Added Homebrew formula (homebrew-tap/Formula/envguard.rb):

  • Supports macOS (both ARM64 and AMD64 architectures)
  • Supports Linux (AMD64 architecture)
  • Includes SHA256 checksums for each binary variant
  • Implements install logic to place the correct binary variant in the bin directory
  • Includes basic test to verify the installation works

• Added documentation (homebrew-tap/README.md):

  • Installation instructions for users to tap the repository and install envguard

Implementation Details

• The formula targets version 0.2.0 of envguard
• Binary selection is handled at both the URL resolution stage (using on_macos/on_linux blocks) and installation stage (using OS and CPU detection)
• Each platform/architecture combination has its own pre-built binary with corresponding SHA256 verification

https://claude.ai/code/session_01GZzqjzdwtip2H6AR7pFCQ8