Cache Github status token #6
Merged
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Currently we're requesting a Github installation access token for every github status update requests.
That's quite spammy for an authentication endpoint. The token is supposed to be cached.
The token is cached in an environment variable.
There was another attempt: #7 , which involved moving all the status updates to one process and caching in memory. However, after implementing it I discovered (via our existing test suite, yay!) that it can't work: we rely on being able to leak the request pipe FD to subprocesses, so we can't wait for commandHandler to finish. So I implemented it the other way.
This PR also adds a mock Github API server and some tests for the commit status functionality. Note: the server doesn't verify any authentication tokens.