PHP 7.3 v2 Specialization (#1110)

* Added support for PHP 7.3 v2 Specialization
* Add builder dockerfile for PHP7
* Support mcrypt in PHP 7.3

environments/php7/builder/Dockerfile

@@ -0,0 +1,71 @@
+ARG BUILDER_IMAGE=fission/builder
+FROM ${BUILDER_IMAGE}
+
+FROM php:7.3-alpine
+
+ENV PATH="/root/.composer/vendor/bin:${PATH}" \
+    COMPOSER_ALLOW_SUPERUSER=1
+
+RUN echo 'http://dl-4.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories \
+    && apk --no-cache add \
+    git \
+    curl \
+    curl-dev \
+    libcurl \
+    zlib-dev \
+    freetype-dev \
+    jpeg-dev \
+    libjpeg-turbo-dev \
+    postgresql-dev \
+    libmcrypt-dev \
+    libpng-dev \
+    icu-dev \
+    gettext-dev \
+    vim \
+    libxml2-dev \
+    freetype-dev \
+    libzip-dev \
+    unzip \
+    libc6-compat \
+    openssl \
+    gcc \
+    autoconf \
+    make \
+    libc-dev
+
+RUN docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/
+
+# Install useful extensions
+RUN docker-php-ext-install \
+    opcache \
+    bcmath \
+    ctype \
+    curl \
+    dom \
+    iconv \
+    fileinfo \
+    gd \
+    gettext \
+    intl \
+    json \
+    mysqli \
+    pgsql \
+    pcntl \
+    pdo \
+    ftp \
+    pdo_mysql \
+    pdo_pgsql \
+    phar \
+    simplexml \
+    xmlrpc \
+    zip
+
+RUN pecl install \
+    mcrypt-1.0.2
+RUN docker-php-ext-enable \
+    mcrypt
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+COPY --from=0 /builder /builder
+COPY defaultBuildCmd /usr/local/bin/build

environments/php7/builder/defaultBuildCmd

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -euxo pipefail
+
+if [ -f ${SRC_PKG}/composer.json ]
+then
+    cd ${SRC_PKG}
+    composer install --no-interaction
+fi
+cp -r ${SRC_PKG} ${DEPLOY_PKG}