/usr/lib/x86_64-linux-gnu/libvolk.so is in libvolk1-dev 1.2.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libvolk.so.1.1
/usr/lib/x86_64-linux-gnu/libvolk.so.1.1