Update run.sh

run.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 
-# Careful: can't create tmp files from this script
-cat nginx.conf | sed "s|API_URL|${API_URL}|g" > /etc/nginx/sites-available/default
+# Replace placeholder in nginx configuration
+cat nginx.conf | sed "s|API_URL|${API_URL:-http://127.0.0.1:7861}|g" > /etc/nginx/sites-available/default
+
+# Start Nginx service
 service nginx start
+
+# Keep container running
 sleep infinity
+