Add ping API endpoint to check liveness (#646)

Signed-off-by: yeya24 <yb532204897@gmail.com>
Co-authored-by: ti-srebot <66930949+ti-srebot@users.noreply.github.com>

pkg/apiserver/server.go

@@ -89,6 +89,7 @@ func serverRegister(lx fx.Lifecycle, s *Server, conf *config.ChaosDashboardConfi
 	mux.Handle("/", http.StripPrefix("/", uiserver.Handler(assetFs)))
 	mux.Handle("/api/", Handler(s))
 	mux.Handle("/api/swagger/", swaggerserver.Handler())
+	mux.HandleFunc("/ping", pingHandler)
 
 	srv := &http.Server{Handler: mux}
 
@@ -133,3 +134,8 @@ func Handler(s *Server) http.Handler {
 		s.handler(w, r)
 	})
 }
+
+func pingHandler(w http.ResponseWriter, _ *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "pong\n")
+}