adding docker image builds badge

Author: jkyberneees

README.md

@@ -1,4 +1,6 @@
 # restana-static
+[![build images](https://github.com/BackendStack21/restana-static/actions/workflows/build_images.yaml/badge.svg)](https://github.com/BackendStack21/restana-static/actions/workflows/build_images.yaml)
+
 Efficiently serve static files using Node.js and Docker containers: https://itnext.io/restana-static-serving-the-frontend-with-node-js-beyond-nginx-e45fdb2e49cb
 
 ```Dockerfile