add logging

src/main.rs

@@ -1,5 +1,15 @@
+use tracing_subscriber::prelude::*;
+
 #[tokio::main]
 async fn main() -> eyre::Result<()> {
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::EnvFilter::new(
+            std::env::var("RUST_LOG")
+                .unwrap_or_else(|_| "octopush,octopush_cli,octopush_core,octopush_infra".into()),
+        ))
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
     let cli = octopush_cli::OctopushCli::new();
     cli.execute().await
 }