It is possible to use environment variables to get a CA certificate into a runner in GitLab CI with dind service.
Additionally, Docker-in-Docker with TLS enabled is supported by GitLab.com shared runners.
This allows the Docker image to have all of the docker tools installed and run the job script in context of the image in privileged mode.
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“Docker-in-Docker” ( dind ) means:
The Docker image has all of the docker tools installed and can run the job script in context of the image in privileged mode.
We recommend you use Docker-in-Docker with TLS enabled, which is supported by GitLab.com shared runners .
Use Docker to build Docker images | GitLab
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