Yannick Welsch b57d21bab1
User proper write-once semantics for GCS repository ()
There's no need for an extra blobExists() call when writing a blob to the GCS service. GCS provides
an option (with stronger consistency guarantees) on the insert method that guarantees that the
blob that's uploaded does not already exist.

Relates to 
2018-05-17 13:58:10 +02:00
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