Add information about GitLab multi target docker build template
Description
Following the addition of uis/devops/continuous-delivery/ci-templates#78 (closed) to the CI templates, this ticket is to ensure that there's information in the guidebook how to use this template.
Further details
The template is commented and this comment can be used as a guidance.
Task list
Acceptance criteria
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Documentation can be found if searching for phrases like "multiple docker images", etc. I.e. the docs should be worded around the problem and not just the solution -
Documented how to use the template -
Documented how to still build the final target when including the template -
Documented how to disable certain jobs in child pipelines (using MULTI_DOCKER_IMAGE_BUILD_ENABLED) -
Have the MR reviewed by someone that has used the pipeline already
Links/references
Edited by Sebastiaan ten Pas