GitLab

This will allow us to link a release to a file to specific Vagrant Cloud version.

See also https://docs.gitlab.com/ee/ci/metrics_reports.html

Our security concept doesn't allow us to move artifacts built in non-secure environments to secure environments.
This means we'll have to make sure that the boxes we release are built on a runner marked as
'secure'.

Using actual VMs to build VMs is slow and error-prone (you need to use
VNC to see what is going on, and booting takes over +110 seconds as we
wait to be sure Arch Linux is ready).

build.sh can build all three images in ~135 seconds (assuming all the
packages is cached), we still need to use a VM for the actually building
in GitLab CI (as that is the only safe way it can be done at the
moment), which is a bit slower (~22 min vs ~13 min (Packer)), but that
isn't really a big issue.

In the future we can hopefully switch to Kate Containers[1] and reduce
the build time significantly.

[1] infrastructure#108

Kristian Klausen authored Aug 15, 2020 and Sven-Hendrik Haase committed Aug 16, 2020

Fix #108

In my tests, this slows down the builds from 4m to 10m per build BUT allows use build
on public non-kvm-enabled builders which gives us the ability to run random MRs on CI.
Additionally, we can now run many builds in parallel.

Python scripts were removed.

Keeping artifacts brings us no benefits and the produced artifacts
should never be used, because they consist of vagrant specific
settings.

For building QEMU/Virtualbox images, checkout the cloud.json file

Increase expire_in to 2d so that we can be sure that there are always fresh VM images available as artifacts

They are built nightly so we'll have a backlog of two VM images available to download at all times.

Going forward, it makes sense to host these raw images as well as there are some use cases for that.
For instance, what if you don't want to use vagrant but instead just use the raw images in qemu directly?

This makes sure there are no race conditions on our workers or during deployment.
We can only use one hypervisor at a time.