fix: rustls crypto provider + Arc import for cert expiry

apps/monitor/src/main.rs

@@ -4,11 +4,17 @@ mod types;
 
 use anyhow::Result;
 use std::env;
+use rustls;
 use tokio::time::{sleep, Duration};
 use tracing::{error, info};
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    // Install default rustls crypto provider (required for cert expiry checks)
+    rustls::crypto::ring::default_provider()
+        .install_default()
+        .ok(); // ok() — ignore error if already installed
+
     tracing_subscriber::fmt()
         .with_env_filter(env::var("RUST_LOG").unwrap_or_else(|_| "info".into()))
         .init();