Upgrade Swift:4.2 Docker Image to Ubuntu 18.04 from 16.04

[Luke-Roy-IBM]

Ubuntu 16.04 has reached its end of Standard Support and is no longer getting updates (Ubuntu releases)

As the Swift 4.2 Docker image is based on Ubuntu 16.04 is there any plan to replace the image with the Swift 4.2 Docker image based on Ubuntu 18.04?

The Swift 4.2 Dockerfile based on Ubuntu 18.04 already exists in the master branche (Swift 4.2 dockerfile based on Ubuntu 20.04). Would it be possible to replace or add a new Docker image based on this file?