executor/google-batchgood first issue
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Description
Google Batch now supports container streaming (i.e. lazy loading container images) which improves startup time and reduces overhead, especially for fine-grained workloads.
https://cloud.google.com/batch/docs/use-image-streaming
For us to support it in Nextflow we just need to add a config option for enableImageStreaming.
Note that container streaming is currently only supported for container images in Artifact Registry. This is likely because they need to modify the container image format to support the lazy loading, so this requirement is unlikely to change.