Update to Laravel 5.8

docker/php/Dockerfile

@@ -3,10 +3,14 @@ FROM php:7.3-fpm
 RUN apt-get update
 RUN apt-get install -y libgmp-dev
 
+# Copy any config files in
+COPY ext-opcache.ini $PHP_INI_DIR/conf.d/
+
 RUN ln -sf /dev/stderr /var/log/fpm-error.log
 
 RUN docker-php-ext-install \
   mysqli \
   pdo \
   pdo_mysql \
-  gmp
+  gmp \
+  opcache