Add php 7.1 version

Author: ksaveras

.gitignore

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+/.idea

7.1/alpine/Dockerfile

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+FROM php:7.1-cli-alpine
+
+RUN apk update && apk upgrade \
+  && set -xe \
+  && apk add --no-cache --virtual .build-deps \
+    icu-dev \
+    zlib-dev \
+    git \
+    icu-libs \
+    g++ \
+    make \
+    autoconf \
+    libxslt-dev \
+    zlib \
+    wget \
+    curl \
+    libtool \
+    libcurl \
+    openssl-dev \
+    libmcrypt-dev \
+    freetype-dev \
+    libjpeg-turbo-dev \
+    libpng-dev \
+  && apk add --no-cache icu libmcrypt \
+  && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ \
+    --with-png-dir=/usr/include/ \
+    --with-jpeg-dir=/usr/include/ \
+  && docker-php-ext-install gd \
+    mcrypt \
+    intl \
+    zip \
+    pdo_mysql \
+    opcache \
+    iconv \
+  && pecl install xdebug redis \
+  && docker-php-ext-enable xdebug \
+  && apk del --purge .build-deps \
+  && rm -rf /tmp/pear ~/.pearrc /var/tmp/* /tmp/*
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
+  && composer global require hirak/prestissimo --prefer-dist --no-interaction \
+  && rm -rf /root/.composer/cache/*
+
+WORKDIR /app