Preload opcache in Dockerfile

01_opcache.ini

opcache.validate_timestamps=0
opcache.save_comments=0
opcache.enable_cli=1
opcache.enable_file_override=1
opcache.file_cache=/app/opcache

Dockerfile

#BASE
FROM alpine:3.9 as base

RUN apk add php7-pdo_mysql php7-curl php7-json php7-xml php7-tokenizer php7-simplexml 

#DEPENDENCIES
FROM base as dependencies

WORKDIR /app

COPY composer.json /app/
COPY composer.lock /app/

RUN apk add composer php7-posix unzip \
 && composer global require hirak/prestissimo \
 && composer install --no-interaction --no-dev --no-autoloader

COPY . /app

#OPTIMIZED
FROM dependencies as optimized

COPY docker /

RUN apk add php7-opcache \
 && mkdir /app/opcache \
 && composer dump-autoload --classmap-authoritative --optimize

#CLI
FROM dependencies as cli

RUN apk add php7-xmlwriter \
 && composer install

#APP
FROM base

RUN apk add php7-apache2 php7-opcache

COPY docker /

COPY --from=optimized /app /app

EXPOSE 80

CMD httpd -DFOREGROUND