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docker stack was treating the first "-" as a hard default, so
${VAR:?must be set - reason} succeeded when VAR was unset.
Signed-off-by: Dean Chen <862469039@qq.com>
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Fixes: #7313
Summary
${VAR:?must be set - reason}was taking the-default path, sodocker stack configsucceeded when the variable was unset. use whichever of:?,:-,?, and-shows up first, which is what compose already does.Release notes (optional)