Run multiple commands in dockerFile CMD

FROM php:alpine

RUN apk update && apk add zip libxml2-dev libpng-dev && docker-php-ext-install mysqli simplexml mbstring gd 

RUN \

mkdir /var/www && \

cd /var/www && mkdir mybb && cd mybb && \

curl https://resources.mybb.com/downloads/mybb_1815.zip -o mybb.zip && \

unzip mybb.zip "Upload/*" && \

mv Upload/* . && \

rm -Rf Upload mybb.zip && \

mv inc/config.default.php inc/config.php && \

chmod 666 inc/config.php inc/settings.php && \

chmod -R 777 inc/languages && \

chmod 777 cache/ cache/themes/ uploads/ uploads/avatars/ admin/backups/

WORKDIR /var/www

EXPOSE 80

CMD ["sh","-c","[ \"$(ls -A forum)\" ] && (echo \"Forum exist\" && php -S 0.0.0.0:80 -t forum) || (echo \"Forum does not exist, copying...\" && cp -R mybb/* forum && php -S 0.0.0.0:80 -t forum) "]

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Feng