Stefan Agner 33ce44a8c2 Avoid race condition when fetching containers during build (#1671) ...

* Avoid race condition when fetching containers during build

So far only a single builder was active for each architecture. This
toghether with the naming scheme to include architecture/machine name
made sure that an image could only be fetched or used by a single
builder.

However, since most systems are now aarch64, multiple runners are now
active for a single architecture. This makes it necessary to lock
fetching/coping of container images to avoid race conditions.

2021-12-29 15:34:34 +01:00

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