docs(README): add build badge

.vale/Vocab/smtp/accept.txt

@@ -1,6 +1,7 @@
 aws|AWS
 certbot
 cloudflare|Cloudflare
+dev|Dev
 dockerhub|DockerHub
 dkim|DKIM
 env|Env

README.md

@@ -1,5 +1,9 @@
 # SMTP Docker Container
 
+[![cicd-tools](https://img.shields.io/badge/ci/cd:-cicd_tools-blue)](https://github.com/cicd-tools-org/cicd-tools)<br />
+[![smtp-github-workflow-push](https://github.com/niallbyrne-ca/smtp/actions/workflows/workflow-push.yml/badge.svg?branch=master)](https://github.com/niallbyrne-ca/smtp/actions/workflows/workflow-push.yml) <sup>(Master)</sup><br />
+[![smtp-github-workflow-push](https://github.com/niallbyrne-ca/smtp/actions/workflows/workflow-push.yml/badge.svg?branch=dev)](https://github.com/niallbyrne-ca/smtp/actions/workflows/workflow-push.yml) <sup>(Dev)</sup><br />
+
 Wraps [cisagov/postfix-docker](https://github.com/cisagov/postfix-docker) in automation for generating [Let's Encrypt](https://letsencrypt.org/) SSL certificates and dkim DNS records.
 
 On DockerHub: