Add more flags for mpcium-cli to handle configuration management

[anhthii]

Add more flags for mpcium-cli to handle configuration management

Summary

• Added comprehensive configuration management flags to both mpcium and mpcium-cli binaries
• Enhanced password handling with file-based options for automation and security
• Improved TLS configuration flexibility for production deployments

Flag Command Arguments Added

mpcium (Main Node Binary)

• --config, -c: Path to configuration file (allows custom config location)
• --password-file, -f: Path to file containing BadgerDB password (secure automation)
• --age-password-file, -k: Path to file containing password for decrypting .age encrypted node private key

mpcium-cli (Management Tools)

• --config, -c: Path to configuration file (consistent with main binary)

Purpose of Each Flag

Configuration Management

• --config: Enables specifying custom configuration files instead of searching default paths (config.yaml, /etc/mpcium/, $HOME/.mpcium/). Critical for multi-environment deployments and containerized setups.

Security & Automation

• --password-file: Allows BadgerDB password to be loaded from a secure file instead of interactive prompts. Essential for:

  • Automated deployments and CI/CD pipelines
  • Production environments where interactive input isn't available
  • Docker containers and systemd services
  • Secure credential management systems integration

• --age-password-file: Enables automated decryption of age-encrypted node private keys by loading the passphrase from a file. Supports:

  • Unattended node startup in production
  • Integration with secret management systems
  • Secure key handling in orchestrated environments

Additional Improvements

• Enhanced TLS certificate path configuration in production environments
• Improved error handling and memory security (password zeroing)
• Updated config search paths for better system integration
• Added make install target for system-wide binary installation