rfc2136: add support for a new environment variable `RFC2136_TSIG_FILE`

[datafoo]

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• Yes, I've searched similar issues on GitHub and didn't find any.

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Detailed Description

For the DNS provider rfc2136, rather that having to parse a key ourselves to extract the key name (i.e. RFC2136_TSIG_KEY), algorithm (i.e. RFC2136_TSIG_ALGORITHM) and secret (i.e. RFC2136_TSIG_SECRET), would it be possible to provide a new environment variable such as RFC2136_TSIG_FILE which would be the path to the key file generated by tsig-keygen?

This way, lego would parse the file itself.

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