fix(db): add postgres auto-sync entrypoint wrapper to ensure role login and credentials persist across rebuilds

docker-compose.yml

@@ -13,6 +13,9 @@ services:
       - "${DB_PORT:-5432}:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
+      - ./postgres-entrypoint.sh:/usr/local/bin/postgres-entrypoint.sh:ro
+    entrypoint: ["/usr/local/bin/postgres-entrypoint.sh"]
+    command: ["postgres"]
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres} -d ${POSTGRES_DB:-jobsboard}"]
       interval: 5s

postgres-entrypoint.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+set -e
+
+# Run background synchronization once PostgreSQL is up on local unix socket
+sync_credentials() {
+  until pg_isready -q -h /var/run/postgresql; do
+    sleep 0.5
+  done
+
+  USER="${POSTGRES_USER:-postgres}"
+  PASS="${POSTGRES_PASSWORD:-postgres}"
+
+  psql -v ON_ERROR_STOP=0 -h /var/run/postgresql -U postgres -d postgres <<-EOSQL >/dev/null 2>&1
+    DO \$\$
+    BEGIN
+      IF NOT EXISTS (SELECT FROM pg_catalog.pg_roles WHERE rolname = '$USER') THEN
+        CREATE ROLE "$USER" WITH LOGIN SUPERUSER PASSWORD '$PASS';
+      ELSE
+        ALTER ROLE "$USER" WITH LOGIN SUPERUSER PASSWORD '$PASS';
+      END IF;
+    END
+    \$\$;
+EOSQL
+}
+
+sync_credentials &
+
+exec docker-entrypoint.sh "$@"