Add automated installation script for macOS users

[Copilot]

This PR adds a comprehensive automated installation script for Devilbox targeting macOS users as requested in the feature request. The script automates all the manual installation steps into a single command.

Features

The install.sh script automates the complete Devilbox installation process:

1. Repository Setup: Clones Devilbox to ~/Workspace
2. Configuration: Creates .env file from env-example
3. Docker Compose: Copies Magento2 override file
4. Environment Variables: Adds DEVILBOX_CONTAINERS and DEVILBOX_PATH to shell profile
5. User Configuration: Automatically sets NEW_UID and NEW_GID using id -u and id -g
6. Homebrew Integration: Installs Homebrew if not present
7. Command Setup: Creates symlink /opt/homebrew/bin/dvl → ~/Workspace/dvl.sh

Usage

# One-command installation
curl -sSL https://raw.githubusercontent.com/devilbox-community/devilbox/mainline/install.sh | bash

# Or download and run with options
curl -sSL https://raw.githubusercontent.com/devilbox-community/devilbox/mainline/install.sh -o install.sh
chmod +x install.sh
./install.sh --help

Options

• --help: Show help message
• --verbose: Enable verbose output
• --force: Force installation even if Devilbox already exists

After Installation

# Start Devilbox
dvl up

# Access the intranet
open http://localhost

Documentation

Updated README.md with a new "Automated Installation: macOS" section that provides clear instructions for using the installation script.

Testing

The script includes comprehensive error handling and has been tested for:

• ✅ Syntax validation
• ✅ Error handling
• ✅ File operations
• ✅ UID/GID configuration
• ✅ Shell profile detection
• ✅ Command-line argument parsing

Fixes #6.

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