Composer: file_put_contents(./composer.json): failed to open stream: Permission denied

This error message is indicating that the script is trying to write to the file "composer.json" in the current directory (indicated by "./"), but it doesn't have the necessary permissions to do so. The most likely cause of this issue is that the user running the script does not have write permissions for the directory in which "composer.json" is located. To fix this issue, you can either change the permissions of the directory to allow writing, or run the script as a user with the appropriate permissions.