Separate PHP error log from NGINX error log

[emanuelb]

if PHP error occur it will be added to nginx error file at (as STDERR used by default):

/var/log/nginx-error.log

I think it will be better to seperate them, and have unique error file for PHP errors, by using error_log directive with fullpath such as /var/log/php-error.log (will also require creating it in run.sh with chown to nobody): https://secure.php.net/manual/en/errorfunc.configuration.php#ini.error-log

[J0WI]

nginx is no longer part of the phpmyadmin image.

[emanuelb]

nginx is no longer part of the phpmyadmin image.

apache is used instead by default, this issue may still be relevant (need to check logs of php errors for that)