Update composer to 1.8, php to 7.3, add opcache

Dockerfile

@@ -1,20 +1,27 @@
-FROM composer:1.7 as composer
+FROM composer:1.8 as composer
 
-FROM php:7.2-fpm-alpine3.8
-
-WORKDIR /app
+FROM php:7.3-fpm-alpine3.9
 
 COPY --from=composer /usr/bin/composer /usr/bin/composer
 
+WORKDIR /app
+
 RUN apk add --no-cache bash icu icu-dev libxml2-dev nodejs-current nodejs-npm
 
 RUN apk add --no-cache --virtual .node-build-deps \
-    g++ \
-    make \
-    python
-
-RUN docker-php-ext-configure intl \
-    && docker-php-ext-install -j$(nproc) intl pdo_mysql zip
+        g++ \
+        make \
+        python \
+    && docker-php-ext-configure intl \
+    && docker-php-ext-install -j$(nproc) intl opcache pdo_mysql \
+    && apk del .node-build-deps
 
 RUN npm install -g yarn
 
+ENV PATH="/app:/app/vendor/bin:${PATH}"
+
+COPY conf.d/opcache.ini /usr/local/etc/php/conf.d/opcache.ini
+# sane defaults for opcache
+ENV PHP_OPCACHE_VALIDATE_TIMESTAMPS="0"
+ENV PHP_OPCACHE_MAX_ACCELERATED_FILES="10000"
+ENV PHP_OPCACHE_MEMORY_CONSUMPTION="192"

conf.d/opcache.ini

@@ -0,0 +1,9 @@
+[opcache]
+opcache.enable=1
+opcache.revalidate_freq=0
+opcache.validate_timestamps=${PHP_OPCACHE_VALIDATE_TIMESTAMPS}
+opcache.max_accelerated_files=${PHP_OPCACHE_MAX_ACCELERATED_FILES}
+opcache.memory_consumption=${PHP_OPCACHE_MEMORY_CONSUMPTION}
+opcache.max_wasted_percentage=10
+opcache.interned_strings_buffer=16
+opcache.fast_shutdown=1