Please include pgloader in docker container builds
### Problem to solve Current gitlab docker container images do not include pgloader, su there is built in way to migrate to them from another DB server without manually adding pgloader. Even better - include that and instructions on migrating to docker based deployment from a mysql deployment. ### Target audience Administrators of instances - Sidney, Systems Administrator, https://design.gitlab.com/research/personas#persona-sidney ### Further details Self explanatory, migration from existing instance, particular if running MySQL. ### Proposal Add pgloader to DockerFile build. ### What does success look like, and how can we measure that? Is pgloader available and usable via docker exec. ### Links / references
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