The SIH container entrypoint resolves host.docker.internal via getent
hosts and feeds the first result to mavlink -t and uxrce_dds_client -h.
On Docker Desktop for Windows the lookup can return an IPv6 ULA first,
and both PX4 modules only parse IPv4, so they error out with
'invalid partner ip' and PX4 boots with no working MAVLink or DDS link.
Switch to getent ahostsv4, which only returns IPv4 records, so the IP
injected into the startup scripts is always parseable.
Signed-off-by: Ramon Roche <mrpollo@gmail.com>
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