Document cgroup v1 issue for Docker desktop on Mac since v4.3.0

[ankudinov]

The cgroup v1 issue was discussed in this thread before: #470
Nevertheless, I'd suggest to add a note specifically for containerlab on MacOS to inform the user about changes in v4.3.0 and v4.4.2: https://docs.docker.com/desktop/mac/release-notes/
One reason to do that is the problem with docker desktop GUI and the deprecatedCgroupv1 flag. When configured in Docker desktop preferences, it may not work or crash Docker desktop.
The working solution is documented here:
docker/for-mac#6073
I'd suggest to refer to this thread or add required commands directly to the Containerlab guide:

# Stop running Docker
test -z "$(docker ps -q 2>/dev/null)" && osascript -e 'quit app "Docker"'
# Install jq and moreutils so we can merge into the existing json file
brew install jq moreutils
# Add the needed cgroup config to docker settings.json
echo '{"deprecatedCgroupv1": true}' | \
  jq -s '.[0] * .[1]' ~/Library/Group\ Containers/group.com.docker/settings.json - | \
  sponge ~/Library/Group\ Containers/group.com.docker/settings.json
# Restart docker desktop
open --background -a Docker

[hellt]

Hi @ankudinov
so this is only needed for those images which still require cgroupv1, like ceos on mac?

[hellt]

added in 35642ea