IPv6 ITs failing in GitHub Actions

[jfallows]

Even though all ITs pass locally on OS X, the two IPv6 tests fail consistently on GitHub Actions automated build.

[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.904 s - in org.reaktivity.nukleus.tcp.internal.streams.ServerRouteCountersIT
[INFO] 
[INFO] Results:
[INFO] 
Error:  Failures: 
Error:    ServerIT.shouldEstablishConnectionToAddressAnyIPv4 Specified behavior did not match expected:<...d nukleus:begin.ext [${proxy:matchBeginEx()
                              .typeId(nukleus:id("proxy"))
                              .addressInet4()
                                .protocol("stream")
                                .destination("127.0.0.1")
                                .destinationPort(8080)
                                .build()
                              .build()}

connected]



#
# Copyright 20...> but was:<...d nukleus:begin.ext [PROXY_BEGIN_EX [typeId=4, address=PROXY_ADDRESS [inet4=PROXY_ADDRESS_INET4 [protocol=STREAM, source=octets[4], destination=octets[4], sourcePort=46830, destinationPort=8080]], infos=array32<4, 0>]]



#
# Copyright 20...>
Error:    ServerIT.shouldEstablishConnectionToAddressAnyIPv6 Specified behavior did not match expected:<...d nukleus:begin.ext [${proxy:matchBeginEx()
                              .typeId(nukleus:id("proxy"))
                              .addressInet4()
                                .protocol("stream")
                                .destination("127.0.0.1")
                                .destinationPort(8080)
                                .build()
                              .build()}

connected]



#
# Copyright 20...> but was:<...d nukleus:begin.ext [PROXY_BEGIN_EX [typeId=4, address=PROXY_ADDRESS [inet4=PROXY_ADDRESS_INET4 [protocol=STREAM, source=octets[4], destination=octets[4], sourcePort=46834, destinationPort=8080]], infos=array32<4, 0>]]



#
# Copyright 20...>
[INFO] 
Error:  Tests run: 97, Failures: 2, Errors: 0, Skipped: 2

Would prefer not to disable these ITs, so we need to find out how to enable IPv6 for GitHub Actions.

[jfallows]

Looks like IPv6 capability is being tracked by ongoing conversation in actions/runner-images#668 even though the issue is already closed.