Attempt to fix podman DNS issue

As found by @holly-cummins, podman's internal DNS
is case-sensitive. This seems to be causing issues
for some our dev-services being run on podman.
This changes ensures that the hostname is always lowercase
thus circumventing the problem.

See [this](https://quarkusio.zulipchat.com/#narrow/stream/187038-dev/topic/DNS.20woes.3A.20Podman.20.2B.20Mongo.20.2B.20Dev.20services.20.2FTestcontainers.20-.2E.2E.2E/near/287736870) for a complete discussion