Fix slave replication auth: add .pgpass for passwordless pg_basebackup

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/pgsql/init-slave.sh

@@ -6,7 +6,12 @@ until pg_isready -h db-master -U e-ticket; do
   sleep 2
 done
 
+echo "db-master:5432:replication:replicator:e-ticket" > ~/.pgpass
+chmod 600 ~/.pgpass
+
 rm -rf /var/lib/postgresql/data/*
 pg_basebackup -h db-master -D /var/lib/postgresql/data -U replicator -Fp -Xs -P -R
 
 echo "hot_standby = on" >> /var/lib/postgresql/data/postgresql.conf
+
+exec "$@"