ci-demand README: cache folder must support chmod (FAT, WSL /mnt/c are refused) #124

On Linux or macOS, a ci-demand cache folder on a filesystem where chmod has no effect (FAT, WSL /mnt/c, some network mounts) is now refused with exit 2. That is the right default, but the README does not say so.

Fix: one README line saying the cache folder must support private permissions, and what to do instead (pick a folder on a normal disk).

From the quick-check review of #113: #113 (comment)

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