Added HHVM container and used environment variable for switching

hhvm/Dockerfile

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+FROM ubuntu:14.04  
+
+RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0x5a16e7281be7a449 
+RUN apt-get update -y && apt-get install -y software-properties-common \
+   && add-apt-repository "deb http://dl.hhvm.com/ubuntu $(lsb_release -sc) main" \
+   && apt-get update -y \
+   && apt-get install -y hhvm \
+   && apt-get clean \
+   && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /var/www/laravel
+
+ADD server.ini /etc/hhvm/server.ini
+
+RUN usermod -u 1000 www-data
+
+WORKDIR /var/www/laravel
+
+CMD ["/usr/bin/hhvm", "-m", "server", "-c", "/etc/hhvm/server.ini"]
+
+EXPOSE 9000

hhvm/server.ini

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+; php options
+
+pid = /var/run/hhvm/pid
+
+; hhvm specific
+hhvm.server.port = 9000
+hhvm.server.type = fastcgi
+hhvm.server.default_document = index.php
+hhvm.server.error_document404 = index.php
+hhvm.server.upload.upload_max_file_size = 25M
+hhvm.log.level = Error
+hhvm.log.header = true
+hhvm.log.access[default][file] = /var/log/hhvm/access.log
+hhvm.log.access[default][format] = "%h %l %u %t \"%r\" %>s %b"
+hhvm.server.source_root=/var/www/laravel/public
+hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc
+
+; Uncomment to log to files instead of STDOUT
+;hhvm.log.use_log_file = true
+;hhvm.log.file = /var/log/hhvm/error.log