add build tag

Author: alexei-led

README.md

@@ -1,4 +1,4 @@
-![Docker Pulls](https://img.shields.io/docker/pulls/alexeiled/nsenter.svg?style=popout) [![](https://images.microbadger.com/badges/image/alexeiled/nsenter.svg)](https://microbadger.com/images/alexeiled/nsenter "Get your own image badge on microbadger.com")
+[![](https://github.com/alexei-led/nsenter/workflows/DockerHub/badge.svg)] ![Docker Pulls](https://img.shields.io/docker/pulls/alexeiled/nsenter.svg?style=popout) [![](https://images.microbadger.com/badges/image/alexeiled/nsenter.svg)](https://microbadger.com/images/alexeiled/nsenter "Get your own image badge on microbadger.com")
 
 # nsenter
 
@@ -10,6 +10,10 @@
 
 Read the official `nsenter` [documentation](http://man7.org/linux/man-pages/man1/nsenter.1.html).
 
+## Continuously Updated with GitHub Actions
+
+The `nsenter` is automatically updated when a new version of [util-linux](https://github.com/karelzak/util-linux) is released.
+
 ## How do I *use* `alexeiled/nsenter`?
 
 Enter the container: