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docs: Example for getenv

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docs/Templates.md
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@ -81,6 +81,11 @@ In addition to the [built-in Go template functions and features][tt], `webhook`
The `getenv` template function can be used for inserting environment variables into a templated configuration file.
Example:
```json
"Secret": "{{getenv \"TEST_secret\" | js}}"
```
### `cat`
The `cat` template function can be used to read a file from the local filesystem. This is useful for reading secrets from files. If the file doesn't exist, it returns an empty string.