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Hi wonderful ironicers!

Unless you spend the whole last week under a rock (good for you - I mean
it!), you must be already aware that the classical CentOS as we know it is
going away in favour of CentOS Stream, and maybe as soon as in the end of
2021!

For us it means two things:
1) Bifrost will test with CentOS Stream, which may not 100% match the
current stable RHEL.
2) We need to decide what to do with our published DIB images [1],
currently based on CentOS 8.

I'd like to concentrate on problem #2.

We have conducted an experiment of switching to CentOS Stream, and it did
not go so well. The image size has increased from ~ 340 MiB to nearly 450
MiB, causing serious issues in CI jobs using it. Because of this we're
reverting the switch and considering other options.

One is to figure out what causes the size increase and remove packages or
manually delete files. We're already doing it quite intensively, so I
expect this option to be time-consuming. We'll probably have to repeat this
exercise regularly to keep up with the distribution changes.

The other option is to switch to another distro. Debian looks promising in
this context: 3 years of support and the image size is just 273 MiB. I have
a patch [2] up for people who want to try the resulting image on their bare
metal machines.

What do you think? Are there any concerns with either option?

[1] https://tarballs.openstack.org/ironic-python-agent/dib/files/
[2]
https://review.opendev.org/c/openstack/ironic-python-agent-builder/+/767158

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