If the target is ARM and the host is ARM, this should work with just `cargo`. I'm not sure if this
works for all ARM host/target combos, or if the CPU architecture must be an exact match.
But it doesn't really matter too much, since at least for now there's no ARM builds for
`cross` (https://github.com/cross-rs/cross/issues/1612). So even if cross-compilation doesn't work
natively, we couldn't use `cross` in this case either.
I also rewrote the `set-cross-compile.sh` in Python. By "I", I mean I had Claude do it and then I
tweaked it.
If we're running cargo, we need to add the runner name to the cache. Otherwise things that link
against system packages, like openssl, can break when we use the same cache across different
versions of the runner OS. For example, when going from Ubuntu 20.04 to 22.04, we move from OpenSSL
1.1.x to 3.x.
For test commands, there can be arguments passed to the test binary like `-- --ignored` or `--
--test-threads=1`. For these cases to work properly, the `args` parameter needs to be added to the
end of the 'test' command.
This commit updates the tests to check that this works and also rewrites the
test script from Bash to Perl.
Co-authored-by: Dave Rolsky <autarch@urth.org>
