Update entrypoint.sh

entrypoint.sh

@@ -3,6 +3,12 @@
 # Get the username from the command line arguments
 USERNAME=$1
 
+# Check if the username is empty
+if [ -z "$USERNAME" ]; then
+    echo "No username provided. Exiting..."
+    exit 1
+fi
+
 # Check if the user already exists
 if id "$USERNAME" >/dev/null 2>&1; then
     echo "User $USERNAME already exists."