test/runner: guard Build fields with mutex to fix data race - #9
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The build goroutine's deferred closure writes b.Failures, b.Duration, b.LogURL and b.LogFile while the status update goroutines spawned by updateStatus read b.Failures and persist the whole Build via save. This is a concurrent read/write race on the shared Build struct. Add a mutex to Build and hold it when committing the final build state in the deferred closure and when snapshotting/persisting in updateStatus, so the two critical sections serialize.
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The build goroutine's deferred closure writes b.Failures, b.Duration, b.LogURL and b.LogFile while the status update goroutines spawned by updateStatus read b.Failures and persist the whole Build via save. This is a concurrent read/write race on the shared Build struct.
Add a mutex to Build and hold it when committing the final build state in the deferred closure and when snapshotting/persisting in updateStatus, so the two critical sections serialize.