fix: add entrypoint script to wait for postgres before starting

entrypoint.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -e
+
+# Extract host and port from DATABASE_URL for wait check
+DB_HOST=$(echo "$DATABASE_URL" | sed -E 's|.*@([^/:]+).*|\1|')
+DB_PORT=$(echo "$DATABASE_URL" | sed -E 's|.*:[0-9]+/([0-9]+).*|\1|' | head -1)
+
+if [ -z "$DB_PORT" ] || [ "$DB_PORT" = "$DB_HOST" ]; then
+    DB_PORT="5432"
+fi
+
+echo "Waiting for postgres at $DB_HOST:$DB_PORT ..."
+
+max_retries=30
+counter=0
+until pg_isready -h "$DB_HOST" -p "$DB_PORT" -q 2>/dev/null; do
+    counter=$((counter + 1))
+    if [ $counter -ge $max_retries ]; then
+        echo "ERROR: postgres at $DB_HOST:$DB_PORT not ready after ${max_retries}s"
+        exit 1
+    fi
+    echo "  postgres not ready, retrying in 2s ... ($counter/$max_retries)"
+    sleep 2
+done
+
+echo "postgres is ready!"
+
+# Execute the passed command (supervisord)
+exec "$@"