add default image docker fallback

crates/devcontainer-rs/Cargo.toml

@@ -10,6 +10,7 @@ futures-util = { workspace = true }
 tar = "0.4"
 tokio = { workspace = true }
 tokio-stream = { workspace = true }
+tracing = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }
 anyhow = { workspace = true }