Add gitub actions badge

[skip ci]

Author: cmuench

README.md

@@ -2,6 +2,7 @@
 
 ![Maintenance Badge](https://img.shields.io/maintenance/yes/2021.svg)
 [![Go Report Card](https://goreportcard.com/badge/github.com/cmuench/inotify-proxy)](https://goreportcard.com/report/github.com/cmuench/inotify-proxy)
+[![Go Github Action Workflow](https://github.com/cmuench/inotify-proxy/workflows/Go/badge.svg)](https://github.com/cmuench/inotify-proxy/actions?query=workflow%3AGo)
 
 This tools helps to detect changed files in Docker Containers or in Virtual Machines (e.g. Vagrant).
 If a file is changed from host system a file watcher inside the container detects the change