chore(docker): add healthcheck

Author: marcoieni

Dockerfile

@@ -29,10 +29,14 @@ FROM ubuntu:22.04 as runtime
 
 WORKDIR /
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y ca-certificates
+# curl is needed for healthcheck
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y ca-certificates curl
 
 COPY --from=build /app/target/release/bors .
 
 EXPOSE 80
 
+HEALTHCHECK --timeout=10s --start-period=10s \
+  CMD curl -f http://localhost/health || exit 1
+
 ENTRYPOINT ["./bors"]

src/github/server.rs

@@ -8,7 +8,7 @@ use anyhow::Error;
 use axum::extract::State;
 use axum::http::StatusCode;
 use axum::response::IntoResponse;
-use axum::routing::post;
+use axum::routing::{get, post};
 use axum::Router;
 use octocrab::Octocrab;
 use std::future::Future;
@@ -47,10 +47,15 @@ pub type ServerStateRef = Arc<ServerState>;
 pub fn create_app(state: ServerState) -> Router {
     Router::new()
         .route("/github", post(github_webhook_handler))
+        .route("/health", get(health_handler))
         .layer(ConcurrencyLimitLayer::new(100))
         .with_state(Arc::new(state))
 }
 
+async fn health_handler() -> impl IntoResponse {
+    (StatusCode::OK, "")
+}
+
 /// Axum handler that receives a webhook and sends it to a webhook channel.
 pub async fn github_webhook_handler(
     State(state): State<ServerStateRef>,