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compose: don't treat hyphens in :? error messages as defaults - #7316

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TastyHeadphones wants to merge 1 commit into
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TastyHeadphones:fix/stack-interp-hyphen-in-required-msg
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TastyHeadphones wants to merge 1 commit into
docker:masterfrom
TastyHeadphones:fix/stack-interp-hyphen-in-required-msg

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${VAR:?must be set - try again} was succeeding when VAR was unset, because hardDefault matched the - inside the error message and treated it as ${VAR-default}.

Reordered the substitute funcs so :? / ? run before -, and made hardDefault skip strings that already contain ?. Added regression tests.

Fixes #7313

hardDefault ran before requiredNonEmpty and matched any "-", so a
required-variable error message like "must be set - try again" was
parsed as ${VAR-default} and silently succeeded.

Fixes docker#7313
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docker stack subcommands: the :? interpolation operator and hyphens do not mix

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