refactor: enhance Dockerfile and Justfile for multi-feature builds; i…

[tamada]

…mprove logging in Gixor initialization

[Copilot]

Pull request overview

This pull request refactors the Dockerfile and Justfile to support building Docker images with multiple feature flags (default, uselibgit, usegix), fixes a bug in the git2 repository opening logic, and adds debug logging to the Gixor initialization process.

Changes:

• Refactored Docker build recipes in Justfile to support multiple feature builds with different tags
• Updated Dockerfile to accept FEATURES and APT_OPTIONAL build arguments for flexible builds
• Fixed bug in git2.rs where repository was incorrectly opened using file path instead of repository path
• Added debug logging in Gixor initialization to display config path and contents

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
lib/src/lib.rs	Added debug logging statements to log configuration path and JSON-serialized config during Gixor initialization
lib/src/gitbridge/git2.rs	Fixed bug: changed from opening git repository using boilerplate file path to using repository root path
Justfile	Refactored docker and docker_buildx recipes to build multiple Docker images with different feature flags; added command to gen_complete recipe
Dockerfile	Added FEATURES and APT_OPTIONAL build arguments; fixed base-path to use absolute path; added apt-get installation for optional packages; added chown for nonroot user

---

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

[Copilot]

The ARG APT_OPTIONAL is defined in the builder stage but is used here in the runtime stage. In Docker, ARG values don't carry over between stages unless redeclared. Add "ARG APT_OPTIONAL" in the runtime stage (after line 26 or before line 33) to make the build argument available in this stage.

[Copilot]

Using unwrap() in a logging statement can cause a panic if the config fails to serialize to JSON (e.g., if it contains non-serializable data). Consider using unwrap_or_else() or unwrap_or() to provide a fallback message instead of panicking during logging.

Suggested change

	log::debug!("config: {}", serde_json::to_string_pretty(&config).unwrap());
	log::debug!(
	"config: {}",
	serde_json::to_string_pretty(&config)
	.unwrap_or_else(|e| format!("(failed to serialize config: {e})"))
	);

[Copilot]

Spelling error: "Managenemnt" should be "Management".

Suggested change

	org.opencontainers.image.description="Git Ignore Managenemnt System for Multiple Repositories."
	org.opencontainers.image.description="Git Ignore Management System for Multiple Repositories."