The generated tar archives contain the uid/gid of the builder,
if unpacked as root on another system those will denote nothing
or an unexpected user/group.
The expectation would be uid/gid = 0.
Use a simple enough tar format as well.
The Mac version of tar (bsdtar?) does not support those flags,
for CI the separate gnu-tar is installed.
This allows simplification, this functionality was added long
ago to CMake.
Further motivation is to be able to re-direct the installation,
make/ninja install allow this by setting DESTDIR but this
generally doesnt work well with window paths (see [1]).
[1] - https://cmake.org/cmake/help/latest/envvar/DESTDIR.html#envvar:DESTDIR