New feature

Sometimes azcopy can use more memory than is available. See #5799 (comment) for a description.

Use case

We can set the maximum azcopy memory usage so that it does not exhaust local memory and crash.

Suggested implementation

We should be able to add the following environment variable in the same manner as other azcopy opts: AZCOPY_BUFFER_GB https://learn.microsoft.com/en-us/azure/storage/common/storage-use-azcopy-optimize#optimize-memory-use