Shutdown on ctrl_c

[raphael-goetz]

Resolves: #89

[Copilot]

Pull request overview

This PR implements graceful shutdown on Ctrl+C/SIGINT for the Taurus service. The main changes restructure the application to use tokio::select! for monitoring multiple concurrent tasks (NATS worker and optional health service) and handle shutdown signals appropriately. The PR also includes dependency updates, improved logging throughout, and adds support for dynamic mode flow definition synchronization at startup.

Key Changes:

• Added Ctrl+C signal handling using tokio::select! to gracefully coordinate shutdown of worker and health service tasks
• Restructured main event loop to spawn tasks and monitor them for completion or shutdown signals
• Enhanced error handling and replaced println! statements with structured log macros throughout
• Added dynamic mode flow synchronization at startup and corresponding configuration

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
taurus/src/main.rs	Core implementation of shutdown handling with tokio::select!, task spawning, improved logging, and dynamic mode sync
taurus/src/config/mod.rs	Added definitions config field and changed default mode from STATIC to DYNAMIC
taurus/Cargo.toml	Added "flow_service" feature flag to code0-flow dependency
Cargo.toml	Updated dependencies (code0-flow 0.0.19, tucana 0.0.42, async-nats 0.45.0) and added "signal" feature to tokio
Cargo.lock	Dependency lock file updates reflecting version changes and new transitive dependencies (walkdir, signal-hook-registry, etc.)
.env-example	Added DEFINITIONS environment variable example

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[Copilot]

The result of FlowUpdateService::send().await is being ignored. If the sync fails, the application will continue without any indication of the failure. Consider logging an error or handling the failure case, e.g., if let Err(e) = FlowUpdateService::from_url(...).send().await { log::error!("Failed to sync flow definitions: {:?}", e); }