php-fpm: try to fix hidden error logs

php-fpm/7.4/Dockerfile

@@ -92,7 +92,7 @@ RUN set -eux; \
 	} > /usr/local/etc/php/conf.d/zz-opcache.ini; \
 	{ \
 	echo 'expose_php = Off'; \
-	echo 'display_errors = Off'; \
+	echo 'display_errors = On'; \
 	echo 'log_errors = On'; \
 	echo 'error_log = /proc/self/fd/2'; \
 	} > /usr/local/etc/php/conf.d/zz-hardening.ini

php-fpm/7.4/www.conf

@@ -45,6 +45,9 @@ slowlog = /var/log/php/www-slow.log
 ; This ensures that any `echo` or `var_dump` calls from workers are captured in the container logs.
 catch_workers_output = yes
 
+; Allow worker processes to write to stderr, which is essential for container logging.
+decorate_workers_output = no
+
 ; We are logging errors to stderr in zz-hardening.ini, so we can disable the FPM access log
 ; to avoid redundant logging and improve performance. Nginx should handle access logging.
 ; access.log = /var/log/php/www-access.log