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Docker's containerd store on ubuntu-26.04 keeps each layer twice, and every leg pre-pulled all 56 images; legs on 72 GB runners ran out of disk in the pull. Legs now switch Docker to overlay2 first, the five largest images are pulled at their first use, and a leg with too little free disk fails before its first case.
check-images.sh reads name:tag literals as image references that bypass versions.env.
The 33 GB of the image table was containerd's compressed size; a probe run measured the same three images at 24.8 GB on containerd and 17.6 GB on overlay2.
…e at a time 7 of the 46 archives saved from containerd's store did not load into overlay2, and an exact key hit never saves again: new keys. A 72 GB runner reached 7 GB free with two lazy images left on it (run 41960912641, shard 2): each now goes when its case ends.
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GeiserX#300