docker: Install qemu-user-static 6.0 to fix segfault
docker: Install qemu-user-static 6.0 to fix segfault

There are issues with qemu-user-static 5.2 crashing when attempting
to allocate guest memory when compiled as a proper statically-linked
binary.

From testing, qemu 6.0 fixes the bug but it's not yet clear which
patch fixes the bug. So until the correct patch is backported to
bullseye, let's install qemu from experimental to pickup the bugfix.

See: #245
See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988174

Signed-off-by: Christopher Obbard <0becaf7888cff31ba54e40b1ffb8263e09b8b7da@collabora.com>

go-debos/debos