feat: add churn v2

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

crates/churn/src/cli.rs

@@ -0,0 +1,36 @@
+use std::net::SocketAddr;
+
+use clap::{Parser, Subcommand};
+
+use crate::{api, state::SharedState};
+
+pub async fn execute() -> anyhow::Result<()> {
+    let state = SharedState::new().await?;
+
+    let cli = Command::parse();
+    if let Some(Commands::Serve { host }) = cli.command {
+        tracing::info!("Starting service");
+
+        notmad::Mad::builder()
+            .add(api::Api::new(&state, host))
+            .run()
+            .await?;
+    }
+
+    Ok(())
+}
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None, subcommand_required = true)]
+struct Command {
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    Serve {
+        #[arg(env = "SERVICE_HOST", long, default_value = "127.0.0.1:3000")]
+        host: SocketAddr,
+    },
+}