Add _FILE Environment Variable Documentation
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@ -112,6 +112,9 @@ Here is a list of supported `providers`, that can automate the DNS verification,
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along with the required environment variables and their [wildcard & root domain support](#wildcard-domains).
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along with the required environment variables and their [wildcard & root domain support](#wildcard-domains).
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Do not hesitate to complete it.
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Do not hesitate to complete it.
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Every lego environment variable can be overridden by their respective `_FILE` counterpart, which should have a filepath to a file that contains the secret as its value.
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For example, `CF_API_EMAIL_FILE=/run/secrets/traefik_cf-api-email` could be used to provide a Cloudflare API email address as a Docker secret named `traefik_cf-api-email`.
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| Provider Name | Provider Code | Environment Variables | Wildcard & Root Domain Support |
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| Provider Name | Provider Code | Environment Variables | Wildcard & Root Domain Support |
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|-------------------------------------------------------------|----------------|---------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------|
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|-------------------------------------------------------------|----------------|---------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------|
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| [ACME DNS](https://github.com/joohoi/acme-dns) | `acme-dns` | `ACME_DNS_API_BASE`, `ACME_DNS_STORAGE_PATH` | Not tested yet |
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| [ACME DNS](https://github.com/joohoi/acme-dns) | `acme-dns` | `ACME_DNS_API_BASE`, `ACME_DNS_STORAGE_PATH` | Not tested yet |
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