Update fail2ban.local for "allowipv6" option

[NBPub]

Log Issue

          Got this on startup of an existing container:

swag  | 2023-01-21 10:26:34,008 fail2ban.configreader   [380]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'

Originally posted by @thespad in #315 (comment)

fail2ban

I am getting this on startup, and have seen it in recent logs from other issues. I looked through the changelog for fail2ban 1.02 and found this:

fail2ban.conf: new fail2ban configuration option allowipv6 (default auto), can be used to allow or disallow IPv6 interface in fail2ban immediately by start (e. g. if fail2ban starts before network interfaces), gh-2804

Possible Fix?

Add ipv6 option to fail2ban.local

allowipv6 = auto or allowipv6 = yes

This should suppress the warning at startup. It could also be something that's configured via environmental variable. I tried adding this to jail.local, but still got the warning.

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[drizuid]

This is not an error and can be ignored. We have no plans to change this from using the default at this time. We may entertain changing this at a later date as part of a larger change.