docs: note --health-cmd always uses CMD-SHELL - #7163
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Runtime health checks go through the image shell, so scratch-based images need HEALTHCHECK CMD in the Dockerfile instead of --health-cmd. Fixes docker#3719 Signed-off-by: Dean Chen <862469039@qq.com>
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Dockerfile HEALTHCHECK can pick CMD vs CMD-SHELL, but docker run --health-cmd always shells out. That bites scratch images with no /bin/sh.
Documented the difference and pointed at Dockerfile HEALTHCHECK CMD for those cases.
Fixes #3719