docs: Update README and CHANGELOG for YAML configuration support - Add Configuration File section with full example - Update Quick Start with both YAML and env var options - Add --config flag to CLI options - Update Environment Variables table with config file equivalents - Expand File Filtering section with customization options - Simplify GitHub Actions example to use config file - Add YAML configuration to CHANGELOG Co-authored-by: r.buddie <r.buddie@gmail.com>

[rossme]

No description provided.

[cursor]

You have run out of free Bugbot PR reviews for this billing cycle. This will reset on February 10.

To receive reviews on all of your PRs, visit the Cursor dashboard to activate Pro and start your 14-day free trial.

[Copilot]

Pull request overview

This PR adds YAML configuration file support to diffdash, enabling teams to share configuration via committed files while keeping secrets in environment variables. The implementation introduces a new ConfigLoader class that handles file discovery and precedence, refactors FileFilter to support configurable filtering rules, and updates the CLI to accept a --config flag.

Changes:

• Added YAML configuration file support with automatic discovery (current dir, git root, or explicit path via --config flag)
• Introduced configurable file filtering with ignore_paths, include_paths, excluded_suffixes, and excluded_directories options
• Refactored FileFilter from static to instance-based implementation while maintaining backwards compatibility

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lib/diffdash/config_loader.rb	New class handling YAML config file loading with environment variable overrides and security considerations
lib/diffdash/config.rb	Updated to delegate to ConfigLoader while maintaining existing API
lib/diffdash/file_filter.rb	Refactored to support instance-based configuration with backwards-compatible class methods
lib/diffdash/cli/runner.rb	Added --config flag support and config info logging
lib/diffdash/outputs/grafana.rb	Updated to accept app_name and pr_deploy_annotation_expr from config
lib/diffdash/engine/change_set.rb	Updated to pass config to FileFilter
spec/diffdash/config_loader_spec.rb	Comprehensive test coverage for ConfigLoader
spec/diffdash/config_spec.rb	Updated tests for Config delegation
spec/diffdash/file_filter_spec.rb	Expanded tests for configurable filtering
diffdash.example.yml	Example configuration file with detailed comments
README.md	Extensive documentation updates covering configuration, file filtering, and GitHub Actions setup
CHANGELOG.md	Documents new features added in this release

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The extract_config_path method doesn't validate that a value follows the --config flag. If --config is the last argument, args[idx + 1] will return nil, which is probably acceptable, but if the next argument is another flag (e.g., diffdash --config --verbose), it will incorrectly use --verbose as the config path. Consider adding validation to ensure the next argument exists and is not another flag.

Suggested change

	args[idx + 1]
	value = args[idx + 1]
	return nil if value.nil? || value.start_with?('-')
	value

[Copilot]

This formatting change makes the code less readable compared to the original. Consider reverting to the more concise original format: "#{dynamic_count} dynamic metric#{"s" unless dynamic_count == 1} detected..."

Suggested change

	warn "[diffdash] Note: #{dynamic_count} dynamic metric#{unless dynamic_count == 1
	's'
	end} detected but cannot be added to dashboard"
	warn "[diffdash] Note: #{dynamic_count} dynamic metric#{"s" unless dynamic_count == 1} detected but cannot be added to dashboard"