Generate postgres user/db for akkounts, use credentials from env

nodes/postgres-6.json

@@ -22,6 +22,7 @@
       "kosmos_kvm::guest",
       "kosmos_postgresql::primary",
       "kosmos_postgresql::firewall",
+      "kosmos-akkounts::pg_db",
       "kosmos-bitcoin::lndhub-go_pg_db",
       "kosmos-bitcoin::nbxplorer_pg_db",
       "kosmos_drone::pg_db",