omit wp-config.php edit if it was mounted readonly

Author: Raphaël Droz

docker-entrypoint.sh

@@ -129,6 +129,9 @@ if [[ "$1" == apache2* ]] || [ "$1" == php-fpm ]; then
 		if [ -e wp-config.php && -n $NO_AUTO_CONFIG ]; then
 			exec "$@"
 		fi
+		if [ -e wp-config.php && ! -w wp-config.php ]; then
+			exec "$@"
+		fi
 		# version 4.4.1 decided to switch to windows line endings, that breaks our seds and awks
 		# https://github.com/docker-library/wordpress/issues/116
 		# https://github.com/WordPress/WordPress/commit/1acedc542fba2482bab88ec70d4bea4b997a92e4