add test code

ci/app/main.go

@@ -12,6 +12,11 @@ func indexHandler(w http.ResponseWriter, r *http.Request) {
     w.Write([]byte("<h1>Hello World, im ver:"+Version+" !</h1>"))
 }
 
+func healthMessage(w http.ResponseWriter, r *http.Request) {
+    w.Header().Add("Content-Type", "application/json")
+    w.Write([]byte(`{"health":"OK"}`))
+}
+
 func main() {
     port := os.Getenv("PORT")
     if port == "" {
@@ -22,5 +27,6 @@ func main() {
 
     mux := http.NewServeMux()
     mux.HandleFunc("/", indexHandler)
+    mux.HandleFunc("/health", healthMessage)
     http.ListenAndServe(":"+port, mux)
 }