compose: set localhost for db port exposition

Moulrequested to merge
db_port_v0.5.5 into main

Otherwise the port get exposed on internet The port might get open in the firewall

https://forum.duniter.org/t/13495/62

These two lines could even be removed. Keeping for setup purpose, and should not hurt as 0.0.0.0 does

Edited by Moul

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