Document extra tarball feature
Follow-up from https://gitlab.nic.cz/turris/turris-os-packages/-/merge_requests/564#note_178120
rescue-image package now supports extra tarball with initial configuration. We should document this feature somewhere.
Follow-up from https://gitlab.nic.cz/turris/turris-os-packages/-/merge_requests/564#note_178120
rescue-image package now supports extra tarball with initial configuration. We should document this feature somewhere.