Add release tags for docker build

[matthew-larner]

It would be great if you could add release tags as part of the docker builds (this can be automated). This is so that we don't have to use the 'latest' tag to prevent auto updating.

[cook1emr]

You can always pin to the digest in the absence of a tag
https://hackernoon.com/docker-images-name-vs-tag-vs-digest