Clean up environments that couldn't be scheduled #41
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After wtsi-hgi/softpack-web#55, nothing will use
id
, and it's badly-named (or at least underdocumented) and doesn't seem useful, so let's remove it.Additionally, environments whose build could not be scheduled (the builder wasn't available, or returned an error) are now cleaned up.
Lastly, add a test to prove to ourselves that there's no (or a very low) chance of a race condition when making multiple commits simultaneously. (And even when adding a random delay in the middle of
commit_and_push
to make a race condition more likely, pygit2 caught the problem and raised an exception.)