Add internal CA to gitlab-agent to it can connect to GitLab instance

General
3

I shall answer myself here, there is an undocumented setting config.caCert and it is used thusly:

helm upgrade --install some-name gitlab/gitlab-agent \
    --namespace gitlab-agent \
    --create-namespace \
    --set image.tag=v15.5.1 \
    --set config.token=gitlab-token \
    --set config.kasAddress=wss://gitlab.domain.local/-/kubernetes-agent/ \
    --set config.caCert="-----BEGIN CERTIFICATE-----
The cert goes here as a string
Note the enclosing quotes
-----END CERTIFICATE-----"

All options can be found here.

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