Draft: pressure-vessel: Generalize sharing other app frameworks' directories

Open Simon McVittie requested to merge wip/smcv/snap into main

In addition to Guix and NixOS, also share equivalent paths used by Snap. We now have enough of these to justify doing this with a loop across an array, to make it easier to add similar things for other app frameworks later.

Helps: https://github.com/ValveSoftware/steam-runtime/issues/586

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