create Dockerfile

Dockerfile

+FROM php:alpine
+
+VOLUME ./:./app
+
+WORKDIR app
+
+COPY . .
+
+ENV COMPOSER_ALLOW_SUPERUSER=1
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+RUN composer install
+
+CMD ["php"]
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