Docker: use Heptapod Internal Tooling CA

of course that's needed here as well, and in fact, both for the
Kaniko script (if needed for S3 layers) and in the Docker build
itself (to grab the .deb from download.heptapod.net).

We avoid installing the authority during the build, so that we don't
depend on a removal script to be sure that it's not trusted after this
single download. It is even removed from /assets to avoid creating
doubt.

--HG--
branch : heptapod-stable
7 jobs for !19 with topic/heptapod-stable/heptapod-tooling in 38 minutes and 33 seconds (queued for 1 second)
merge request
Name Stage Failure
failed
docker-testing Docker
Connecting to download.heptapod.net (download.heptapod.net)|10.6.5.71|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2021-01-05 16:49:33 ERROR 404: Not Found.

sed: can't read /opt/gitlab/etc/gitlab.rb.template: No such file or directory
error building image: error building stage: failed to execute command: waiting for process to exit: exit status 2
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1