fix: replace localhost with ip address in case localhost is ipv6 addr?? Norbert had an issue with his docker container where the healthcheck was timing out/failing. He diagnosed it as a ipv6 address bound to localhost. Not sure if this is the right fix. Might be better to determine where localhost is bound (V4 or V6 address) but I don't have an environment I can test with.

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Description: this is the issue tracker for roundup.
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