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Avoids the error "Error: error preparing container xyz... for attach: crun: open /proc/sys/net/ipv4/ping_group_range: Read-only file system: OCI runtime error" when using `podman run --net bridge` inside rootful Podman running without --security-opt unmask=ALL (or 'unmask=/proc/*') Signed-off-by: Joakim Nohlgård <joakim@nohlgard.se>