GitLab Docs monthly release process

When a new GitLab version is released on the 22nd, we need to create the respective single Docker image, and update some files so that the dropdown works correctly.

1. Add the chart version

Since the charts use a different version number than all the other GitLab products, we need to add a version mapping:

NOTE: Note: The charts stable branch is not created automatically like the other products. There's an issue to track this. It is usually created on the 21st or the 22nd.

To add a new charts version:

Make sure you're in the root path of the gitlab-docs repository.
Open content/_data/chart_versions.yaml and add the new stable branch version using the version mapping. Note that only the major.minor version is needed.
Create a new merge request and merge it.

TIP: Tip: It can be handy to create the future mappings since they are pretty much known. In that case, when a new GitLab version is released, you don't have to repeat this first step.

2. Create an image for a single version

The single docs version must be created before the release merge request, but this needs to happen when the stable branches for all products have been created.

Make sure you're in the root path of the gitlab-docs repository.
Run the Rake task to create the single version:
```
./bin/rake "release:single[12.0]"
```
A new Dockerfile.12.0 should have been created and .gitlab-ci.yml should have the branches variables updated into a new branch. They will be automatically committed.
Push the newly created branch, but don't create a merge request. Once you push, the image:docker-singe job will create a new Docker image tagged with the branch name you created in the first step. In the end, the image will be uploaded in the Container Registry and it will be listed under the registry environment folder at https://gitlab.com/gitlab-org/gitlab-docs/-/environments/folders/registry (must have developer access).

Optionally, you can test locally by building the image and running it:

docker build -t docs:12.0 -f Dockerfile.12.0 .
docker run -it --rm -p 4000:4000 docs:12.0

Visit http://localhost:4000/12.0/ to see if everything works correctly.

3. Create the release merge request

NOTE: Note: To be automated.

Now it's time to create the monthly release merge request that adds the new version and rotates the old one:

Make sure you're in the root path of the gitlab-docs repository.

Create a branch release-X-Y:

git checkout master
git checkout -b release-12-0

Rotate the online and offline versions:

At any given time, there are 4 browsable online versions: one pulled from the upstream master branches (docs for GitLab.com) and the three latest stable versions.

Edit content/_data/versions.yaml and rotate the versions to reflect the new changes:
- online: The 3 latest stable versions.
- offline: All the previous versions offered as an offline archive.
Update the :latest and :archives Docker images:

The following two Dockerfiles need to be updated:
1. dockerfiles/Dockerfile.archives - Add the latest version at the top of the list.
2. Dockerfile.master - Rotate the versions (oldest gets removed and latest is added at the top of the list).
In the end, there should be four files in total that have changed. Commit and push to create the merge request using the "Release" template:
```
git add content/ Dockerfile.master dockerfiles/Dockerfile.archives
git commit -m "Release 12.0"
git push origin release-12-0
```

The versions dropdown is in a way "hardcoded". When the site is built, it looks at the contents of content/_data/versions.yaml and based on that, the dropdown is populated. So, older branches will have different content, which means the dropdown will list one or more releases behind. Remember that the new changes of the dropdown are included in the unmerged release-X-Y branch.

The content of content/_data/versions.yaml needs to change for all online versions (stable branches X.Y of the gitlab-docs project):

Run the Rake task that will create all the respective merge requests needed to update the dropdowns and will be set to automatically be merged when their pipelines succeed:

NOTE: Note: The release-X-Y branch needs to be present locally, otherwise the Rake task will abort.
```
./bin/rake release:dropdowns
```
Visit the merge requests page to check that their pipelines pass, and once all are merged, proceed to the following and final step.

TIP: Tip: In case a pipeline fails, see troubleshooting.

5. Merge the release merge request

The dropdown merge requests should have now been merged into their respective version (stable X.Y branch), which will trigger another pipeline. At this point, you need to only babysit the pipelines and make sure they don't fail:

Check the pipelines page and make sure all stable branches have green pipelines.
After all the pipelines of the online versions succeed, merge the release merge request.
Finally, run the Build docker images weekly pipeline that will build the :latest and :archives Docker images.

Once the scheduled pipeline succeeds, the docs site will be deployed with all new versions online.

Troubleshooting

Releasing a new version is a long process that involves many moving parts.

`test_internal_links_and_anchors` failing on dropdown merge requests

NOTE: Note: We now pin versions in the .gitlab-ci.yml of the respective branch, so the steps below are deprecated.

When updating the dropdown for the stable versions, there may be cases where some links might fail. The process of how the dropdown MRs are created have a caveat, and that is that the tests run by pulling the master branches of all products, instead of the respective stable ones.

In a real world scenario, the Update 12.2 dropdown to match that of 12.4 merge request failed because of the test_internal_links_and_anchors test.

This happened because there has been a rename of a product (gitlab-monitor to gitlab-exporter) and the old name was still referenced in the 12.2 docs. If the respective stable branches for 12.2 were used, this wouldn't have failed, but as we can see from the compile_dev job, the master branches were pulled.

To fix this, re-run the pipeline (https://gitlab.com/gitlab-org/gitlab-docs/pipelines/new) for the update-12-2-for-release-12-4 branch, by including the following environment variables:

BRANCH_CE set to 12-2-stable
BRANCH_EE set to 12-2-stable-ee
BRANCH_OMNIBUS set to 12-2-stable
BRANCH_RUNNER set to 12-2-stable
BRANCH_CHARTS set to 2-2-stable

This should make the MR pass.

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