Add php extensions

- bcmath
- bz2
- exif
- gmp

Author: idecardo

Dockerfile

@@ -1,42 +1,52 @@
 FROM php:alpine
 
-# PHP
+ENV COMPOSER_ALLOW_SUPERUSER=1 \
+    PATH="./vendor/bin:$PATH"
+
 RUN apk add --update --no-cache \
-    freetype \
-    freetype-dev \
-    libjpeg-turbo \
-    libjpeg-turbo-dev \
-    libpng \
-    libpng-dev \
-    libtool \
-    libxml2-dev \
-    libzip-dev \
     openssh-client \
-    rsync \
-    # Configure extensions
-    && docker-php-ext-configure \
-    gd \
-    --with-freetype-dir=/usr \
-    --with-jpeg-dir=/usr \
-    --with-png-dir=/usr \
-    && docker-php-ext-configure \
-    zip --with-libzip \
-    # Install extensions
+    rsync
+
+RUN apk add --update --no-cache -t .persistent-deps \
+        # for bz2 extension
+        bzip2-dev \
+        # for gd --with-freetype-dir option
+        freetype-dev \
+        # for gmp extension
+        gmp-dev \
+        # for gd --with-jpeg-dir option
+        libjpeg-turbo-dev \
+        # for gd --with-png-dir option
+        libpng-dev \
+        # for zip extension
+        libzip-dev \
+    # Environment
+    && set -xe \
+    # Configure
+    && docker-php-ext-configure gd \
+        --with-freetype-dir=/usr/include \
+        --with-jpeg-dir=/usr/include \
+        --with-png-dir=/usr/include \
+    && docker-php-ext-configure zip \
+        --with-libzip \
     && docker-php-ext-install \
-    gd \
-    pcntl \
-    pdo_mysql \
-    zip \
-    # Delete dependencies
+        bcmath \
+        bz2 \
+        exif \
+        gd \
+        gmp \
+        pdo_mysql \
+        zip \
+    # Composer
+    && php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/local/bin --filename=composer \
+    # Cleanup
     && apk del --no-cache \
-    freetype-dev \
-    libjpeg-turbo-dev \
-    libpng-dev \
-    && rm -rf /var/cache/apk/*
-
-# Composer
-RUN curl -s https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin/ --filename=composer
-ENV COMPOSER_ALLOW_SUPERUSER=1
-ENV PATH="./vendor/bin:$PATH"
+        freetype-dev \
+        libjpeg-turbo-dev \
+        libpng-dev \
+    && rm -rf \
+        /tmp/* \
+        /var/cache/apk/* \
+        /var/tmp/*
 
 WORKDIR /var/www