use upper directory of former 'rw' session in 'ro' mode#674

casparvl merged 2 commits intoEESSI:2023.06-software.eessi.ioEESSI/software-layer:2023.06-software.eessi.iofrom

trz42:overlay_upper_read_only_v2trz42/software-layer:overlay_upper_read_only_v2Copy head branch name to clipboard