Remove 'make test' logic from .github/workflows

[martinholmer]

Fixes #338 by not running tests on GitHub.

The "make test" command still works locally when the two 2015 PUF files are located in the tmd/storage/input folder.

[donboyd5]

Thanks, @martinholmer, and FYI @nikhilwoodruff. I think this is a good solution. I prefer it to a working version of PR #342 because I don't believe we can be confident of (and have time for) creating synthetic data that would be equivalent for test purposes to the real data.

In addition, it solves a potentially concerning issue with the existing PAT approach: in that approach we effectively are releasing the PUF to anyone who has a PAT, perhaps putting us into a policing role we don't want. (The synthetic data approach solves this issue, too.)

I know you don't need approval for merging, but I recommend you go forward with merging.

I do have one reservation that we might want to talk about if we end up doing follow-on work on tmd. If there ever are many contributors to this project, we might want some mechanism to enforce test-passing before changes are merged. As I understand it, this PR puts the onus on the contributors (in practice, only you and me now) to be sure tests pass on our local machines before we merge anything. That's probably fine with just 2 of us, but if more people become involved it seems not safe enough, plus it doesn't ensure that tests pass on multiple machines. So if we work on this again, I suggest we discuss this.

[martinholmer]

@donboyd5, Thanks for your thoughtful comments on PR #343.