Kind: document how to use a kind image as gitlab service

[TheErk]

What would you like to be added:

Would it be possible to explain/support the usage of a kind image that enables the use
of kind as a gitlab service: https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#what-is-a-service

Why is this needed:

It would ease the use of kind in order to do simple in gitlab CI tests of k8s usage.

[TheErk]

This is linked to the usage described in #619

[BenTheElder]

This should probably go against https://github.com/kind-ci/examples.

kind works anywhere docker works properly + you can get the static binary so we don't publish images like this currently.

Note that gitlab will not have a free tier for CI soon, so after September we are exceedingly unlikely to do any support from the examples repo... https://about.gitlab.com/2019/03/21/six-more-months-ci-cd-github/

[BenTheElder]

/priority backlog

[TheErk]

Ok I see your point.
Our use case was in our privately hosted gitlab CI, but that use case I guess we could go along either with bringing the kind binary into our job image or craft such a service image ourselves.
Thank you for the fast answer.

[BenTheElder]

👍

An example for gitlab in the CI examples repo would be awesome, I don't think we'll be able to maintain it easily though. I don't have access to a paid gitlab and the free CI is going away 😬

[BenTheElder]

I think the only core contributor using gitlab CI is @munnerz and I'm pretty sure only with the Kubernetes executor. We'll want external help for documenting this one.
/help

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In response to this:

I think the only core contributor using gitlab CI is @munnerz and I'm pretty sure only with the Kubernetes executor. We'll want external help for documenting this one.
/help

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[TheErk]

Once I'll manage to find a proper configuration working (kind and gitlab) (cf #630) I'll definitely post something here in order to share with others.

[BenTheElder]

there is currently https://github.com/kind-ci/examples/blob/master/.gitlab-ci.yml

[aojea]

@TheErk can we close this? is that link in the previous comment solving the issue?

[TheErk]

I'll try the solution of the link today and come back here right away.

[TheErk]

So the provided solution does not work for me because my current gitlab-ci config does not seem allow me to run docker:dind as a service (service is not starting) as done https://github.com/kind-ci/examples/blob/9021a580cbe505a5eaca98d9ab09c43e92adbe07/.gitlab-ci.yml#L6

We should nevertheless close this issue because this appear to be a gitlab ci config issue on my side and nothing else.