GH Actions: fix CI pipeline for XDP packages

[romeroalx]

Package libxdp-dev is available from the backports repository for Debian Bullseye.

Use a more recent version of actions to avoid warnings related to Nodejs 16.

Test PDNS build-and-test-all workflow - Debian 12: https://github.com/romeroalx/pdns/actions/runs/7728319018

Test PDNS build-and-test-all workflow - Debian 11: https://github.com/romeroalx/pdns/actions/runs/7728319010

[romeroalx]

Hi @rgacogne, in this repository, we build images for Debian 11 and 12 that later are used by the PDNS workflow build-and-test-all, although we no longer use 11 in master (only in the branch real/rec-5.0.0, almost sure).

In this PR, I am proposing to add the repository backports for installing the new xdp packages, but I am not sure if it is better to just set skipXDP=True for the Debian 11 build. Do you have any preference?

[rgacogne]

Thanks for looking into this!

In this PR, I am proposing to add the repository backports for installing the new xdp packages, but I am not sure if it is better to just set skipXDP=True for the Debian 11 build. Do you have any preference?

Is there anything broken at the moment? I tried to be careful about not breaking anything, and disabled XDP support for the workflows using an image without xdp (misc-dailies.yml and codeql-analysis.yml which are running ubuntu-22.04). I'm afraid it's not clear to me where we use Debian 11 to build/test dnsdist?

[romeroalx]

Thank you for your answer, @rgacogne

To give you more context, we build docker images with pre-installed packages that are common for the workflow build-and-test-all in PowerDNS/pdns - master. We do this using Debian 11 and Debian 12 as the base image.

Two days ago, the runs started failing for the build based on Debian 11: run.

As part of the build done, the function install_dnsdist_build_deps is called as can be seen here. In this function, XDP packages are installed if not set otherwise but are not used further.

Hope it clarifies this :)

[rgacogne]

Thanks, that's indeed the part I was missing :) Sorry about not seeing that coming!
I think the best option would be to stop calling install-dnsdist-build-deps for the Debian 11 image since we do not use for anything dnsdist-related, as far as I can tell? Otherwise setting skipXDP=True looks good as well.