feat: add simple health check

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

crates/churning/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "churning"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dagger-sdk = "0.2.2"
+dagger-rust = "0.2.0"
+tokio.workspace = true
+eyre = "*"