This PR implements a complete alpha release stream for Homebridge APT packages, enabling early testing of new features before they reach beta.

What's Added

Alpha Package Configuration:

• Created alpha/64bit/package.json and alpha/32bit/package.json with latest alpha versions:
  • Homebridge: 2.0.0-alpha.39
  • Homebridge Config UI X: 5.5.1-alpha.0
  • Node.js: 24.7.0 (64-bit) / 22.19.0 (32-bit)

Build System Support:

• Modified build.sh to support PKG_RELEASE_TYPE=alpha
• Alpha builds automatically select appropriate package.json based on architecture
• Follows same pattern as existing beta builds

Automated Workflows:

• alpha-stage-1_update_alpha_dependencies.yml: Daily dependency updates at 5 AM Eastern
• alpha-stage-2_build_alpha_release_and_store.yml: Builds and publishes alpha packages
• homebridge-alpha-bot.json: Configuration for automated alpha dependency tracking

APT Repository:

• Alpha packages published to repo.homebridge.io under "alpha" channel
• Separate from beta and stable channels for isolation

Documentation:

• Added alpha installation instructions to README.md
• Includes warning about experimental nature of alpha builds

Installation

Users can now install alpha builds using:

# Add alpha repository
echo "deb [signed-by=/usr/share/keyrings/homebridge.gpg] https://repo.homebridge.io alpha main" | sudo tee /etc/apt/sources.list.d/homebridge.list > /dev/null

# Install alpha version
sudo apt-get update
sudo apt-get install homebridge

This enables the Homebridge community to test cutting-edge features and provide feedback before they reach beta status.

Fixes #170.

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