document yaml-ish .env file syntax and spacing rules #23633
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also, add example showing spacing rules Signed-off-by: Adam Monsen <[email protected]>
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Oct 31, 2025
content/manuals/compose/how-tos/environment-variables/variable-interpolation.md
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Description
This patch documents syntax rules for spacing and delimiters in .env files.
Today while reviewing some code I discovered Docker .env files may use colons as delimiters. This appears to be intentional but I don't see it documented anywhere.
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