feat(stovepipe): add and wire the buildsignal stage controller#409
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What?
Adds
stovepipe/controller/buildsignalplus the newRecordqueue message/proto andTopicKeyRecord.Processconsumes aBuildSignal(build id), loadsBuild+Request, no-ops if the request is terminal, pollsbuildRunner.Status, persists a real status transition via CAS (BuildStore.Update) with terminal status write-once (a later poll of a flaky backend can never overwrite an already-committed terminal status), and either reschedules itself viaPublishAfter(5s whileaccepted, 2s whilerunning) or, once terminal, publishes torecord. Wires the controller intomain.goand registers thebuildsignal(subscribed) andrecord(publish-only, no consumer yet) topics.Test Plan
make build,make test- all clean.Issue