What is the default gitlab-ci image?

Question

I've looked at the gitlab docker documentation but I cannot find it, what is the default gitlab-ci docker image?

(I'm not setting default:image:)

Answer 1

So taking from the comments, the image is shown at start of build and for the curious around gitlab.com shared runners there's details on gitlab site for the saas_runners

For linux shared runners the default image at time of writing is ruby:3.1

For on premise (own runners), the default image is specified at time of registering the runner.