new: [pandachi-install] ``pgm`` allows overriding default PGUSER and PGHOST.

bin/pandachi-install

@@ -72,11 +72,14 @@ pgpass="/srv/datastore/data/postgres/var/lib/postgresql/data/pgpass"
 }
 cp "\$pgpass" /root/.pgpass
 
-PGUSER=postgres
+PGUSER=\${PGUSER:-postgres}
+
+if [ -z "\$PGHOST" ]; then
   PGHOST=\$(docker-ip | grep postgres | xargs echo | cut -f 3 -d " ") || {
     echo "No local running postgres docker found." >&2
     exit 1
   }
+fi
 export PGHOST PGUSER
 EOF