title: The error “base64: unrecognized option: w” is output in alpine linux
body: <p>The following error was output when executing <code>codecept -c src run acceptance</code> command on alpine linux:</p>
  
  <blockquote>
    <p>none
    base64: unrecognized option: w
    BusyBox v1.30.1 (2019-06-12 17:51:55 UTC) multi-call binary.</p>
    
    <p>Usage: base64 [-d] [FILE]</p>
    
    <p>Base64 encode or decode FILE to standard output
     -d Decode data</p>
  </blockquote>
  
  <p>I can't see the command being executed by codecept.</p>
  
  <p>I tried to add base64 in apk but base64 did not exist.</p>
  
  <p>Dockerfile:</p>
  
  <pre><code>FROM node:10-alpine AS node
  FROM php:7.1-fpm-alpine
  
  ENV GITHUB_OAUTH_TOKEN test
  ENV COMPOSER_ASSET_VERSION 1.3.1
  ENV DOCKERIZE_VERSION v0.6.1
  ENV PATH=~/.composer/vendor/bin:$PATH
  
  # install packages
  RUN apk add -U --no-cache \
          curl-dev \
          libxml2-dev \
          libpng-dev \
          libjpeg-turbo-dev \
          zip \
          libzip-dev \
          unzip \
          gmp-dev \
          python \
          make \
          autoconf \
          memcached-dev \
          libmemcached-dev \
          libmcrypt-dev \
          icu-dev \
          g++
  
  RUN pecl install xdebug \
                   memcached
  
  # install PHP extensions
  RUN docker-php-source extract \
      &amp;&amp; cp /usr/src/php/ext/openssl/config0.m4 /usr/src/php/ext/openssl/config.m4
  RUN docker-php-ext-configure gd --with-png-dir=/usr/include --with-jpeg-dir=/usr/include \
      &amp;&amp; docker-php-ext-configure soap --enable-soap
  RUN docker-php-ext-install \
      pdo \
      pdo_mysql \
      mysqli \
      mbstring \
      mcrypt \
      xml \
      intl \
      opcache \
      gd \
      soap \
      zip \
      &amp;&amp; docker-php-ext-enable xdebug \
                               memcached
  
  # install composer
  RUN curl -sS https://getcomposer.org/installer | php \
      &amp;&amp; mv composer.phar /usr/local/bin/composer
  
  # install composer plugin
  RUN composer global require hirak/prestissimo \
      &amp;&amp; composer config --global github-oauth.github.com $GITHUB_OAUTH_TOKEN \
      &amp;&amp; composer config -g repos.packagist composer https://packagist.jp \
      &amp;&amp; composer global require fxp/composer-asset-plugin:^$COMPOSER_ASSET_VERSION
  
  # install dockerize
  #RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
      #    &amp;&amp; tar -C /usr/local/bin -xzvf dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
      #&amp;&amp; rm dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz
  
  # add node.js npm
  COPY --from=node /usr/local /usr/local
  
  RUN mkdir -p /project/test
  
  WORKDIR /project/test
  
  CMD ["php-fpm"]
  
  #RUN rm /usr/local/bin/yarn /usr/local/bin/yarnpkg
  </code></pre>