What does "nginx permission denied on stderr" mean when the container is running as a non-root user?

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"nginx permission denied on stderr" means that the Nginx process that is running inside the container does not have the necessary permissions to write to the standard error (stderr) output. This can happen when the container is running as a non-root user and the user does not have the necessary permissions to write to the file system location where the Nginx logs are stored. To resolve this issue, you need to ensure that the non-root user has the necessary permissions to write to the logs directory or change the logs directory to a location where the non-root user has write access.