Move the data to a Cloud Storage bucket, and mount the bucket on the filesystem using Cloud Storage FUSE.

Move the data to a Cloud Storage bucket, and copy the data to the boot disk of the instance via a startup script.

Move the data to a Compute Engine persistent disk, and attach the disk in read-only mode to multiple Compute Engine virtual machine instances.

Move the data to a Compute Engine persistent disk, take a snapshot, create multiple disks from the snapshot, and attach each disk to its own instance.