Carrot setup

[lbergelson]

PR to test setting up carrot.

@KevinCLydon I took your branch and added some stuff on it

1. A dockerfile that just includes the htsjdk source so we can run tests
2. A super basic test and eval wdl pair that doesn't actually use htsjdk at all
3. I registered them all in carrot.

Now we need to:

1. do the magic binding between carrot/docker/wdl
2. make a real actual test that we can run in carrot

[lbergelson]

@cmnbroad once this is wired up we need to talk with you about creating the specific cram test. I'm not sure the best way to do it. I think we could either write a normal htsjdk test which has a path that gets filled in by the carrot test somehow, or we could write a little executable that runs the test given an argument. Either way wouldn't be too hard.

[lbergelson]

#carrot

[lbergelson]

@KevinCLydon I'm missing something, it's not using the result of the test workflow in the eval workflow when I invoke it manually. Is this not the right magic? test_output:test_workflow.result

[lbergelson]

Wait, nevermind, I was confused about which test I ran.