Testcontainers reports the container host as `localhost`, which resolves
to ::1 before 127.0.0.1 on this machine. Docker publishes the mapped port
on IPv4 only, and the IPv6 SYN is dropped rather than refused, so asyncpg
blocked on the first address until its connect timeout instead of falling
back to the second -- the migration fixture hung rather than failing.
127.0.0.1 connects in 0.07s where localhost timed out at 15s; the
integration suite now runs in 3.6s, inside the 10s pytest-timeout.
Ali Zarinkolah
7753651dd6