Add configuration file support (.bushelrc) for Bushel demo

[leogdion]

Overview

Add support for a configuration file to avoid repeating command-line flags and manage multiple environments.

Proposed Feature

Configuration File Format

# .bushelrc (in project root or ~/.bushelrc)
[cloudkit]
container_id = "iCloud.com.brightdigit.Bushel"
key_id = "YOUR_KEY_ID"
key_file = "~/.cloudkit/bushel-private-key.pem"
environment = "development"  # or "production"

[sync]
include_betas = true
include_apple_wiki = true
dry_run = false
verbose = false

[export]
pretty_print = true
signed_only = false

Implementation

• Use a TOML/JSON configuration parser
• Search order: ./bushelrc → ~/.bushelrc → command-line flags
• Command-line flags override config file values
• Add --config flag to specify custom config path

Benefits

• Easier setup for new users
• Environment-specific configurations (dev/prod)
• No need to remember all flags
• Credential management in one place

Example Usage

# Create config file once
cat > .bushelrc <<EOF
[cloudkit]
container_id = "iCloud.com.brightdigit.Bushel"
key_id = "YOUR_KEY_ID"
key_file = "./private-key.pem"
EOF

# Then simple commands
bushel-images sync          # Uses .bushelrc
bushel-images sync --verbose  # Override verbose setting

Security Note

• Add .bushelrc to .gitignore
• Document security best practices
• Consider environment variable expansion in config