Update: Changes to GitLab CI/CD and Docker in Docker with Docker 19.03

Docker's release of version 19.03 introduces automatic TLS certificate generation for Docker in Docker (dind) workflows, impacting GitLab CI/CD processes by requiring TLS certificates for communication. This change, enabled by default from version 19.03, addresses potential security issues but necessitates configuration adjustments, such as mounting certificates in shared volumes under the [runners.docker] section in GitLab Runner configurations. Users can either configure GitLab Runner to use TLS by sharing the certificate directory between the service and job container or disable TLS by setting the DOCKER_TLS_CERTDIR environment variable to an empty value. GitLab.com Shared Runners already accommodate these configurations, ensuring compatibility with both workflows to prevent job failures due to unexpected updates.

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