Dockerfile - Ensure the base image uses a non latest version tag

## Dockerfile - Ensure the base image uses a non latest version tag
<img src='https://whitesource-resources.whitesourcesoftware.com/vulnerability_details.png' width=19 height=20> Violation detected in /docker/mysql/Dockerfile:[3-3]

:page_with_curl: File Type: dockerfile

:no_entry: Details - Ensure the base image uses a non latest version tag