Add a simple reproducibility test command.

[jpakkane]

No description provided.

[fortysixandtwo]

pretty cool, I just gave it a little spin.

Currently ccache in my PATH is not detected in which case it should also abort.

🚀

[fortysixandtwo]

typo: s/reprodicibly/reproducibly

[fortysixandtwo]

Have I missed these?

[jpakkane]

FWICT all warnings are about too many positional arguments, which is unrelated to this change.

[dcbaker]

@jpakkane, we fixed the "too many positional arguments" thing in the master branch

[jpakkane]

All green after rebase.

[dcbaker]

I'd still like to see the protocol used for typing the arguments instead of Any. I've also thought about this a bit more, and I think it would be good to use at least two different return codes, one for reproducibility errors, and one for generic failures that don't mean that there's a reproducibility error. Something like:
0 - everything is fine
1 - there is a reproducibility error
2 - there was an error, but it was not a reproducibility one (exceptions thrown, subprocess failed to run, etc)