fix use of x-* attribute in go templates #22403
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Description
fix https://docs.docker.com/compose/bridge/customize/#add-your-own-templates as attributes with a
-can't be accessed directly using dot-notation in a go template. See https://stackoverflow.com/questions/48146448/range-through-values-within-variable-containing-dashes-in-golang-templatesRelated issues or tickets
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