When using the CI.Dockerfile versioned link, running the curl command to get the Microsoft key in order to install the Microsoft ODBC Driver provides a warning that apt-key is being deprecated. I assume this will need a code upgrade.

root@DOCKER_CONTAINER_NAME:/$ curl -sL https://packages.microsoft.com/keys/microsoft.asc | apt-key add -
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).