Support Docker option for IPv6

[william00179]

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Describe the solution you'd like

I'm trying to use the runner in a IPv6 only environment. The runner itself works well and is able to connect to my Gitlab instance, but when the job starts within its own docker container it gets a connection timeout to Gitlab as its not able to make use of the IPv6 networking.

To allow this to work, enable_ipv6 needs to be set in the Docker configuration otherwise docker networks don't support it.

See https://docs.docker.com/config/daemon/ipv6/ and https://gitlab.com/gitlab-org/gitlab-runner/-/issues/36994

Suggest a solution

Add the enable_ipv6 flag to runner_worker_docker_options. Note the enable_ipv6 documentation is currently missing, see the issue above.

[kayman-mk]

Seems to be mandatory, if you want to IPv6 only.

[kayman-mk]

@william00179 Are you working in a IPv6 only setup? There is #1075 claiming that SSM access in not working for IPv6 only so the Runner will not be able to start.

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This issue was closed because it has been stalled for 15 days with no activity.