Currently, we rebuild the container images everyday, at midnight,
which ensures that we have all the latest changes from every distro
supported in CI.
This approach works fine for the upstream CI, but if we want to use
the CI images to test modules in a local container, for example, as
proposed by PR #556, updating the images daily means that there will
be much more images download that would not be needed, as the public
cloud images of supported distros don't change so often.
This patch proposes to change the build rate from daily to weekly,
reducing the need to download images by users, while still using a
good update window.
It should be noted that, if required, the images can be rebuilt
manually, so any urgent fix is added to the CI images.
In the near future, Github will use Ubuntu 20.04, for workflows, and
this change will keep the upstream CI environment consistent between
Github and Azure.
Azure is building Centos and Fedora containers in every PR. We only need
to have containers builds on a nightly build so we are disabling the
default triggers from Azure.
Added a pipeline file (tests/azure/build-containers.yml) to build test
containers and upload them to quay.io. The pipeline will create
containers with IPA pre-installed for testing proposes on three
different Linux containers: CentOS 7, CentOS 8 and Fedora Latest.
