start server in separator go routine

health.go

@@ -1,6 +1,7 @@
 package dockerhealth
 
 import (
+	"context"
 	"net/http"
 )
 
@@ -12,7 +13,13 @@ var server = &http.Server{
 var Healthy bool = true
 
 func init() {
-	server.ListenAndServe()
+	go func() {
+		server.ListenAndServe()
+	}()
+}
+
+func Stop() {
+	server.Shutdown(context.Background())
 }
 
 type httpHandler struct {