Allow hard-coding IPV4 and IPV6 rather than it being detected

[cmer]

This allows hardcoding IPV4 and IPV6 rather than being automatically detected when renewing SSL certificates.

This is handy in scenarios where outbound traffic comes from a different IP than what would normally be expected.

[milkmaker]

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[DerLinkman]

Where does this IPs are set so the container can get them?

It needs at least a declaration inside the docker-compose.yml for the Static IPv4/IPv6 adress to be used as a variable inside the container...

[cmer]

They are environment variables. If not set (this is the default), the IP is automatically resolved. Otherwise, if set, it uses the hardcoded IP in the environment variables.

[dragoangel]

What is the purpose of this change? What are you trying to solve? If you using SNAT properly this should be never the case. Seems to me like a dirty attempt to fix wrong network configuration. For very broken setups there is already option to skip ip check.