Release 13.4

> How to

During release

1. Push the new version which will create a Docker image with the stable version:

   bundle exec rake "release:single[X.Y]"

2. Edit content/_data/versions.yaml and rotate the versions.
3. Edit dockerfiles/Dockerfile.archives and add the new version.
4. Edit Dockerfile.master and rotate the versions.
5. (Optional) If there are changes in the stable branches of the docs after the release version Docker image was created, rerun the release version pipeline.

Before merge

On the 22nd, before merging this and right after a scheduled pipeline has run:

1. Bump the dropdown versions for all online versions:

   bundle exec rake release:dropdowns

   This will create all the needed merge requests and will set them to MWPS.
2. Once all above MRs are merged, check the newly-created pipelines of the respective versions https://gitlab.com/gitlab-org/gitlab-docs/pipelines. Once they are green, it's time to merge this MR.
3. Manually run the "Build docker images weekly" scheduled pipeline. This is needed so that the image:docs-latest image is built that will contain all the updated versions.