Update to 7.4-alpine

Author: Ivan Rey De Cardo

Dockerfile

@@ -1,53 +1,23 @@
-FROM php:alpine
+ARG PHP_VERSION=7.4
 
-ENV COMPOSER_ALLOW_SUPERUSER=1 \
-    PATH="./vendor/bin:$PATH"
+FROM php:$PHP_VERSION-alpine
 
 RUN apk add --update --no-cache \
-    bash \
-    openssh-client \
-    rsync
+    bash openssh-client rsync
 
-RUN apk add --update --no-cache -t .persistent-deps \
-        # for bz2 extension
-        bzip2-dev \
-        # for gd --with-freetype-dir option
-        freetype-dev \
-        # for gmp extension
-        gmp-dev \
-        # for gd --with-jpeg-dir option
-        libjpeg-turbo-dev \
-        # for gd --with-png-dir option
-        libpng-dev \
-        # for zip extension
-        libzip-dev \
-    # Environment
-    && set -xe \
-    # Configure
-    && docker-php-ext-configure gd \
-        --with-freetype-dir=/usr/include \
-        --with-jpeg-dir=/usr/include \
-        --with-png-dir=/usr/include \
-    && docker-php-ext-configure zip \
-        --with-libzip \
-    && docker-php-ext-install \
-        bcmath \
-        bz2 \
-        exif \
-        gd \
-        gmp \
-        pdo_mysql \
-        zip \
-    # Composer
-    && php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/local/bin --filename=composer \
-    # Cleanup
-    && apk del --no-cache \
-        freetype-dev \
-        libjpeg-turbo-dev \
-        libpng-dev \
-    && rm -rf \
-        /tmp/* \
-        /var/cache/apk/* \
-        /var/tmp/*
+ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
+
+RUN chmod +x /usr/local/bin/install-php-extensions && \
+    install-php-extensions \
+        @composer \
+        bcmath-$PHP_VERSION \
+        bz2-$PHP_VERSION \
+        exif-$PHP_VERSION \
+        gd-$PHP_VERSION \
+        gmp-$PHP_VERSION \
+        pdo_mysql-$PHP_VERSION \
+        zip-$PHP_VERSION
+
+RUN rm -rf /tmp/* /var/cache/apk/* /var/tmp/*
 
 WORKDIR /var/www