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runc v1.2.2 -- "Specialization is for insects."

This is the second patch release of the 1.2.z branch of runc. It
includes two fixes for problems introduced in runc 1.2.0, as well as
some documentation improvements surrounding the overlayfs /proc/self/exe
protections.

 * Fixed the failure of `runc delete` on a rootless container with no
   dedicated cgroup on a system with read-only `/sys/fs/cgroup` mount.
   This is a regression in runc 1.2.0, causing a failure when using
   rootless buildkit. (#4518, #4531)
 * Using runc on a system where /run/runc and /usr/bin are on different
   filesystems no longer results in harmless but annoying messages
   ("overlayfs: "xino" feature enabled using 3 upper inode bits")
   appearing in the kernel log. (#4508, #4530)
 * Better memfd-bind documentation. (#4530)

Thanks to all of the contributors who made this release possible:

 * Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
 * Aleksa Sarai <cyphar@cyphar.com>
 * Austin Vazquez <macedonv@amazon.com>
 * Kir Kolyshkin <kolyshkin@gmail.com>
 * Rodrigo Campos <rodrigoca@microsoft.com>
 * lfbzhm <lifubang@acmcoder.com>

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>