Fix database connection issue and add database migration

startup.sh

@@ -1,8 +1,24 @@
 #!/bin/sh
 
+# Function to check if the database is ready
+wait_for_db() {
+    echo "Waiting for the database to start up..."
+    while ! nc -z db 5432; do
+        sleep 1
+    done
+    echo "Database is now available."
+}
+
 # Start your application here
 # Example: node build/index.js
-# print message
+# Print message
 echo "Starting AdventureLog"
+
+# Wait for the database to start up
+wait_for_db
+
+# Run database migration
 npm run migrate
+
+# Start the application
 node build/index.js