Upgrading buildbot and switching to Debian 11

[Petr Štetiar]

Petr Štetiar <ynezz at true.cz> [2023-05-15 17:35:04]:

Hi,

> FYI, just started moving master buildbot server to a new hardware and will
> move snapshot builds there first to iron out any remaining issues.
> 
> While at it I'm updating it to the latest buildbot 3.8.0 release and switching
> base container images from Debian 10 to Debian 11[1]:
> 
>  "Debian 10 LTS support ends on 6/2024, so it makes no sense to use it as
>   a base for 23.05 release, so lets switch to Debian 11 which should've
>   LTS support till 6/2026."
> 
> I'll try to keep you updated during transition.

So snapshot phase1/images just finished one full build cycle on the new
setup[1] and images should be ready for download and testing.

Currently phase2/packages are being crunched[2] and should should be
available in ~12h or so.

The next steps are roughly following: 

 * prepare the infra for 23.05
 * migrate over 22.03
 * switch to https://buildbot.openwrt.org
 * decomission the old hardware, including the 21.02 build infra

Thank you all involved for your support!

1. https://buildbot.staging.openwrt.org/images/
2. https://buildbot.staging.openwrt.org/master/packages/

Cheers,

Petr