Update Docker image for docs review apps
What does this MR do?
Update Docker image for docs review apps.
Why was this MR needed?
Ruby 2.7 is EOL, let's use the latest version.
There was also a failure installing the gitlab
gem when using Ruby 2.7 https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/7864665537. With this update it is successful https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/7864944181.
What's the best way to test this MR?
- Spin a docs review app.
- Stop the docs review app.
Edited by Achilleas Pipinellis