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Update DinD example for 19.03.1

What does this MR do?

Docker 19.03 enables TLS by default:

Starting in 18.09+, the dind variants of this image will automatically
generate TLS certificates in the directory specified by the
DOCKER_TLS_CERTDIR environment variable.

Warning: in 18.09, this behavior is disabled by default (for
compatibility). If you use --network=host, shared network namespaces (as
in Kubernetes pods), or otherwise have network access to the container
(including containers started within the dind instance via their gateway
interface), this is a potential security issue (which can lead to access
to the host system, for example). It is recommended to enable TLS by
setting the variable to an appropriate value (-e
DOCKER_TLS_CERTDIR=/certs or similar). In 19.03+, this behavior is
enabled by default.

Update the example to use docker over TLS.

Does this MR meet the acceptance criteria?


Performance and testing


If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • [-] Label as security and @ mention @gitlab-com/gl-security/appsec
  • [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • [-] Security reports checked/validated by a reviewer from the AppSec team

Reference gitlab-runner#4501 (closed)

Edited by Steve Xuereb

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