fix: escape dollar signs to avoid variable expansion - #20
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When writing secrets in dotenv style, they may include a dollar sign. Ie.
SOME_KEY="pas$word"However, when dotenv-style readers look at this (include our own reader), they see the
$as an indicator that variable substitution should occur.The fix here is to apply escaping to dollar signs when writing dotenv-style secrets.
SOME_KEY="pas\$word"