add pipeline status to readme

README.md

 # Cyber School Courseware Docker Container 
 
+[Container Registry](https://git.cybbh.space/courseware-as-code/courseware-builder/container/container_registry)
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+[![pipeline status](https://git.cybbh.space/courseware-as-code/courseware-builder/container/badges/master/pipeline.svg)](https://git.cybbh.space/courseware-as-code/courseware-builder/container/-/commits/master)
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 ## Container contents
 
 This container is based on the asciidoctor container on dockerhub: `asciidoctor/docker-asciidoctor`. As such, it is alpine-based.