Fix IPv6 in `selfhost-nginx` #43

Job	Run time
build	36m 0s
test (bitcoind)	4m 4s
test (bitcoin-mainnet)	4m 5s
test (bitcoin-regtest)	3m 50s
test (bitcoin-pruned-mainnet)	3m 15s
test (bitcoin-fullchain-mainnet)	3m 59s
test (bitcoin-fullchain-regtest)	4m 2s
test (bitcoin-txindex-mainnet)	2m 54s
test (bitcoin-zmq-mainnet)	3m 59s
test (bitcoin-zmq-regtest)	3m 44s
test (bitcoin-rpc-proxy)	3m 36s
test (bitcoin-rpc-proxy-mainnet)	2m 39s
test (bitcoin-rpc-proxy-regtest)	3m 56s
test (bitcoin-timechain-mainnet)	5m 43s
test (electrs)	3m 0s
test (electrs-mainnet)	4m 35s
test (electrs-regtest)	4m 30s
test (btcpayserver)	3m 20s
test (btcpayserver-system-mainnet)	21m 39s
test (btcpayserver-system-regtest)	3m 30s
test (lnd)	4m 35s
test (lnd-system-mainnet)	3m 26s
test (lnd-system-regtest)	4m 27s
test (lnd-unlocker-system-mainnet)	3m 31s
test (lnd-unlocker-system-mainnet)	3m 37s
test (ridetheln)	4m 20s
test (ridetheln-system)	3m 17s
test (ridetheln-lnd-system-mainnet)	4m 56s
test (ridetheln-lnd-system-regtest)	2m 35s
test (selfhost)	3m 21s
test (selfhost-nginx)	3m 44s
test (selfhost-onion)	3m 59s
test (selfhost-clearnet)	3m 22s
test (selfhost-clearnet-certbot)	3m 56s
test (tor-hs-patch-config)	3m 24s
test (thunderhub)	3m 22s
test (thunderhub-system-mainnet)	3m 20s
test (thunderhub-system-regtest)	3m 38s
test (btc-rpc-explorer-mainnet)	3m 28s
test (lndconnect)	4m 35s
test (selfhost-dashboard-bin)	4m 9s
test (selfhost-dashboard)	4m 5s
test (btc-transmuter)	3m 26s
test (btc-transmuter-system-mainnet)	4m 55s
test (btc-transmuter-system-regtest)	3m 53s
	3h 41m 41s

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