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Docker 29 broke the integration tests on GitHub Actions. It seems the switch to the containerd image store meant we were trying to mount one overlayfs on top of another which Linux does not currently support. Fixed by moving to the VFS storage driver. This requires more storage so we also need to switch the docker data root to run from /mnt/docker.
VFS creates a separate copy for each layer, so the fewer the better.
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Docker 29 broke the integration tests on GitHub Actions. It seems the switch to the containerd image store meant we were trying to mount one overlayfs on top of another which Linux does not currently support.
Fixed by moving to the VFS storage driver. This requires more storage so we also need to switch the docker data root to run from /mnt/docker.
This has made the tests a fair bit slower as each docker layer is not a full copy. To mitigate that the number of layers in the docker builds has been optimized.