update flag-description for --cgroup-parent #4516
Merged
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relates to:
docker build --cgroup-parent=/foo
doesn't work moby/moby#34469 (comment)This attempts to make it clearer that the --cgroup-parent option is only used for the containers used during build. Instead of mentioning "build container", I opted for using "RUN instructions" (to match the --network description), although this may not be ideal (as it assumes the "Dockerfile" front-end, which of course may not be the case).
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