contrib: install the arm64 compiler tools in the Windows dependency script This lets us build arm64 wheels on Windows. We should update from VS 2017 to VS 2019, but that can wait until there's a clean Windows system available. There's a little bit of handwaving here because I originally installed some packages on the CI system by checking boxes in the GUI installer to get arm64 support, since I didn't know the name(s) of the things needed. Exporting the configuration from the GUI installer showed the list of things present, and then I was able to run `vs_buildtools.exe` on another system that previously had this dependency script run a few years ago, with just this new arg. That allowed the wheels to be built (the process failed on this second system prior to this). The only difference between the CI system configuration prior to installing arm64 stuff and this second system after, is the second system has the WinXP support component. Surprisingly, the arm64 WDK and arm64 CRT or Universal CRT doesn't seem to be required.

wheels: also build the i686 wheel in the CI People of weird hardware use i686 so testing the building it useful.

wheel: reintroduce the building of i686 wheel We now have image to make that work.

wheel: also build the musl wheel in the ci We add a trigger to not run that all the time.

wheel: add a target for amdx86_64-musl wheels These can be installed on alpine… which is quite useful.

packaging: factor the linux-wheels-x86_64 a bit This will make introduction of more variant simpler and testing quicker

packaging: propagate the make option to packaging target This is useful when using --jobs for example

packaging: remove the i686 wheel from the linux-wheels target It is currently broken.

wheels: rely on the image config to be able to access the repository The image should now have the proper config set globally to access this

packaging: explain why we purge while building wheels We also make is a bit narrower so that it is less surprising.

ci: for branches, use a single trigger This trigger will unlock all the job necessary to build wheels and upload nightly build. This should make the nightly build process more pratical. In practice right now, only run pipeline for branch by creating them explicitly on the web. So we could just run everything without trigger, but this is a decision for later. This changeset only focus on making the nightly build process somewhat manageable.

ci: add "sink" for parallel tests This work around the maximum 50 jobs dependencies.

ci: abstract the branch matching regexp This is less error prone and make debugging branch-only pipeline simpler.

branching: merge stable into default

relnotes: fix 6.9rc1 I forgot to remove a bunch of tempate stuff.