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Document getenv template function
Add `getenv` to the template function documentation.
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@ -76,6 +76,19 @@ e.g.
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{{ end }}
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### getenv
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Returns the value of an environment variable.
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Takes a string containing the name of the variable as input. Returns
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an empty string if the variable is not set, otherwise returns the
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value of the variable. Note that in Unix-like environments, the
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variable must also be exported in order to be seen by `hugo`.
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e.g.
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{{ getenv "HOME" }}
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### in
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Checks if an element is in an array (or slice) and returns a boolean. The elements supported are strings, integers and floats (only float64 will match as expected). In addition, it can also check if a substring exists in a string.
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