Impossible to create docker network with ipv6 enabled

[ruben-herold]

Act version

v0.2.69

Feature description

hi,

try to run the self-hosted runner on IPv6 only system. Runner runs fine on the system and connected thanks to nat64 .
Docker config on the host:

{
"ipv6": true,
"ip6tables": true,
"experimental": true,
"fixed-cidr-v6": "fd00::/64",
"default-address-pools": [
    { "base": "172.17.0.0/16", "size": 16 },
    { "base": "172.18.0.0/16", "size": 16 },
    { "base": "172.19.0.0/16", "size": 16 },
    { "base": "172.20.0.0/14", "size": 16 },
    { "base": "172.24.0.0/14", "size": 16 },
    { "base": "172.28.0.0/14", "size": 16 },
    { "base": "192.168.0.0/16", "size": 20 },
    { "base": "fd01::/64", "size": 112 }
  ]
}

But all container networks created via action runner are always without IPv6. See your code:

There is no possible way to inject --ipv6 to network create.
Docker has no config flag to enable it by default

Solution add a config option to enable ipv6 on network create.