Check the code formatting of a PR by looking up the files in git diff HEAD^
If the uncrustify config sees a change, yell about it.
Signed-off-by: Daniel Trevitz <daniel.trevitz@wika.com>
The "install toolchain" step is very slow, and needed to run for each
target part of the build matrix. There is no obvious way to "cache" the
runner environment just before running cmake. Uploading artifacts
separately may be possible but I couldn't find how to do that with a
build matrix or arrays/maps.
Weekly builds, or push/ pullrequest triggered builds, now generate different
names.
