Add healtcheck endpoint

Dockerfile

@@ -25,4 +25,5 @@ COPY --from=builder /app/etc/apiary/apiary.toml /app/apiary.toml
 COPY --from=builder /app/bin/apiary /app/apiary
 EXPOSE 8080
 EXPOSE 2222
+HEALTHCHECK --interval=1m --timeout=10s --start-period=5s --retries=3 CMD curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:8080/api/health || exit 1
 CMD ["/app/apiary", "serve"]

web/server.go

@@ -96,6 +96,7 @@ func NewServer(cfg config.FrontendConfig, hs *ssh.HoneypotServer, store store.Lo
 			r.Get("/stats", s.HandlerStats)
 			r.Get("/stream", s.HandlerAttemptStream)
 			r.Get("/query", s.HandlerQuery)
+			r.Get("/health", s.HandlerHealth)
 		})
 	})
 	s.Handler = r
@@ -273,6 +274,15 @@ func (s *Server) HandlerQuery(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (s *Server) HandlerHealth(w http.ResponseWriter, r *http.Request) {
+	err := s.store.IsHealthy()
+	if err != nil {
+		s.WriteAPIError(w, r, http.StatusInternalServerError, fmt.Sprintf("Health error: %s", err))
+		return
+	}
+	w.Write([]byte(`{}`))
+}
+
 type APIErrorResponse struct {
 	Error string `json:"error"`
 }