This is a docker seccomp profile that allows you to run flatpak
inside a docker container, given some special requirements:
* The host kernel must support unprivileged user namespaces
(Supported by e.g. fedora and ubuntu kernels)
* The seccomp profile must be used
(--security-opt seccomp=flatpak-docker-seccomp.json)
* flatpak is run as a reguler user, not root, in the container
* The full host /proc must be visible in the container
(-v=/proc:/host/proc)
The last one is a bit weird, but the regular /proc in docker
is mounted with some cover-over mounts, and this makes the kernel
disallow mounting a new procfs for the pid namespace. Adding
in a full copy of the host fs causes this to be allowed.
Closes: #2867
Approved by: alexlarsson
