Scott Frederick c8ff874e91 Add builderFor label to ephemeral builder image
Adding a label to the ephemeral builder image cloned from the base
builder image eliminates contention between builds that are run
concurrently. Without this label, concurrent builds could result in
a race condition in the Docker daemon if the ephemeral builder image
shared by builds was deleted by both builds at exactly the same time.

Fixes gh-27888
2021-09-14 15:22:23 -05:00
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