feat: add initial churn

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn-agent/src/main.rs

@@ -1,5 +1,6 @@
 use std::net::SocketAddr;
 
+use axum::{response::IntoResponse, routing::get, Router};
 use clap::{Parser, Subcommand};
 
 #[derive(Parser)]
@@ -44,8 +45,16 @@ async fn main() -> anyhow::Result<()> {
 async fn handle_command(cmd: Command) -> anyhow::Result<()> {
     match cmd.command {
         Some(Commands::Daemon { host }) => {
-            tracing::info!("starting agent server on {}", host);
-            tokio::time::sleep(std::time::Duration::from_secs(60)).await;
+            tracing::info!("Starting churn server");
+
+            let app = Router::new().route("/ping", get(ping));
+
+            tracing::info!("churn server listening on {}", host);
+            axum::Server::bind(&host)
+                .serve(app.into_make_service())
+                .await
+                .unwrap();
+
             Ok(())
         }
         Some(Commands::Connect {
@@ -56,3 +65,7 @@ async fn handle_command(cmd: Command) -> anyhow::Result<()> {
         None => todo!(),
     }
 }
+
+async fn ping() -> impl IntoResponse {
+    "pong!"
+}