Multiple reasons, in particular:
* Doing it in every build & test job duplicates effort, resulting in
the pipeline taking longer than necessary.
* We cannot limit the number of test processes spawned by meson dist.
* There's little point running tests for dist anyway, we just want to
make sure we can build & install from the generated tarball.
This lets us actually limit the number of test processes spawned in
parallel.
(ninja test runs meson test without --num-processes, so it ends up
spawning as many processes in parallel as there are CPU cores)
Without these, the build jobs would spuriously pass if some of the
expected piglit tests didn't run at all.
v2:
* Use local variables instead of starting their names with underscores
(Peter Hutterer)
Will make it easier to do more complex shell stuff.
No functional change intended.
v2:
* Use /bin/bash instead of /bin/sh (Peter Hutterer)
* Export environment variables on a separate line (Peter)
* Use "set" command instead of shell command line arguments, for
consistency with debian-install.sh.
Michel Dänzer