Implements automatic Telegram notifications when new DAppNode releases are created, addressing the requirement to notify users via a designated chat when releases are launched.

What's Changed

🚀 New Telegram Notification System

• Automatic notifications: Sends messages to a configured Telegram chat after successful releases
• Rich messaging: Formatted messages with emojis, release version, and direct GitHub release URLs
• Robust validation: Input validation for release versions and URLs with proper error handling

📁 Files Added/Modified

New Scripts:

• scripts/telegram_notify.sh - Core script that handles Telegram API communication
• test/test_telegram_notify.sh - Comprehensive test suite validating all functionality

Workflow Integration:

• .github/workflows/release.yml - Added Telegram notification step that runs after successful releases
• .github/workflows/test.yml - Added CI integration to run Telegram tests automatically

Documentation:

• README.md - Added notification information to the releases section
• installer_instructions/INSTALLER.md - Detailed setup guide for bot configuration

🔧 How It Works

When the "Pre-release" GitHub Action completes successfully:

1. The workflow executes telegram_notify.sh with the release version and GitHub URL
2. Script validates inputs and sends a professionally formatted message via Telegram Bot API
3. Message includes release version, direct download link, and relevant hashtags

Example message format:

🚀 New DAppNode Release Available!

📦 Version: v0.2.51
🔗 Download: https://github.com/dappnode/DAppNode/releases/tag/v0.2.51

The latest DAppNode release is now available with updated core packages and improvements.

#DAppNode #Release #Decentralized

⚙️ Configuration Required

Repository administrators need to configure two secrets in GitHub Settings → Secrets:

• TELEGRAM_BOT_TOKEN: Bot token from @Botfather
• TELEGRAM_CHAT_ID: Target chat/channel ID

✅ Testing

Includes comprehensive test coverage with CI integration:

• Argument validation (missing, invalid formats)
• URL format validation
• Environment variable checks
• Mock API calls for end-to-end testing
• Automated CI testing: Tests run automatically on pull requests and pushes via dedicated CI job

All tests pass and the system is ready for production use once secrets are configured.

🎯 Benefits

• Immediate notifications: Community gets instant updates about new releases
• Professional presentation: Well-formatted messages with all necessary information
• Zero maintenance: Fully automated with the existing release workflow
• Reliable: Full error handling and validation ensures robust operation
• Continuous validation: CI integration ensures the notification system remains functional

Send a telegram message via a bot to de dessigned chat when a new release is launched.
Message must contain the url of the relase

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