Improve tagging of base image
To avoid duplicated dependency installs among other Docker images, tag the base image in a way that downstream images must opt-in. This avoids accidentally breaks where base
often constantly changing.
This also will make the image easier to find in the registry: https://gitlab.com/gitlab-org/gitlab-docs/container_registry (not just under Root image).
I'm attempting to make this deploy when a change to the base Dockerfile is merged, rather than having to deploy manually. This should save having to remember to run a manual step.
I could see the result of this merged MR being used in the linting images and the single
image.
Closes: #1206 (closed).
Edited by Evan Read