MPTCP CI: now validating stable versions

[Matthieu Baerts <matttbe@kernel.org>]

Hello,

FYI, a new job has recently been added, validating stable versions:

  https://github.com/multipath-tcp/mptcp_net-next/actions/workflows/stable.yml

Results are visible in "flakes" webui + IRC (#mptcp-ci)

  https://ci-results.mptcp.dev/flakes.html

You can see the different results by selecting a "Version" (top left),
e.g.

  https://ci-results.mptcp.dev/flakes.html?branch=stable-6.12

It is using the stable patches that have been queued but not released
yet [1] + pending MPTCP ones available in our patchwork [2], with the
kernel version in the patch subject.


Note that once a week (Sunday), this job is using the selftests from the
'export' branch, e.g.

  https://ci-results.mptcp.dev/flakes.html?branch=latest-6.12


It is important to keep in mind that some tests might be failing
because:

- tests are expecting a fix which has not been backported to stable yet,
  especially when using the selftests from the export branch.
- there might be a behaviour change, but a modification is needed in
  stable packetdrill branches, etc.


It looks important to fix (real) issues from stable in priority.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git
[2] https://patchwork.kernel.org/project/mptcp/list/?state=*

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.