Unfortuantely different versions of DXC accept or fail differently
in some cases. We don't care too much about validating the DXC
behavior itself, but it's useful that all the CI jobs use the
same version so that we don't have to complicate the shader runner
language.
The macOS version is currently bound to be pretty recent because
otherwise libdxil.dylib is not provided. So I'm updating the
Linux and Windows version as well.
I don't expect it should be particularly hard for other maintainers
to keep up with the DXC updates, since it just amounts to
downloading a ZIP file and extracting two libraries.
This unfortunately introduces a lot of failures, because it turns
out there is still work to do there. But at least we can
estimate how bad we're doing.
The previous Intel-based macOS runner was replaced with another one
running as a virtual machine on top of an Apple Silicon host.
Since the current macOS runner is not yet able to deal with
different exit codes, we temporarily allow failure unconditionally.
This will be reverted as soon as the runner issue is fixed.
Autodetection doesn't work, but gitlab does in fact support colour
output. Perhaps more importantly, the "Scroll to next failure" feature
essentially scans the output for red text.
