Add multiple volumes from text file with one src:dest per line

[lab-at-nohl]

Feature request description

Environment variables can be stacked together in a file line by line to be included by --env-file instead of providing many -e ... -e .... Just like this but for volumes, I miss a --volumes-file. Priority low, of course.

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[mheon]

This sounds like a good candidate for our existing config file modules?