Update generated README

Author: tianon

README.md

@@ -14,7 +14,7 @@ For outstanding `logstash` image PRs, check [PRs with the "library/logstash" lab
 
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+-	[![build status badge](https://img.shields.io/github/actions/workflow/status/docker-library/logstash/ci.yml?branch=master&label=GitHub%20CI)](https://github.com/docker-library/logstash/actions?query=workflow%3A%22GitHub+CI%22+branch%3Amaster)
 -	[![build status badge](https://img.shields.io/jenkins/s/https/doi-janky.infosiftr.net/job/update.sh/job/logstash.svg?label=Automated%20update.sh)](https://doi-janky.infosiftr.net/job/update.sh/job/logstash/)
 
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