dockerfile: install ruby2.1 from brightbox/ruby-ng repo

Dockerfile

@@ -3,10 +3,12 @@ MAINTAINER [email protected]
 
 RUN apt-key adv --keyserver keyserver.ubuntu.com --recv E1DF1F24 \
  && echo "deb http://ppa.launchpad.net/git-core/ppa/ubuntu trusty main" >> /etc/apt/sources.list \
+ && apt-key adv --keyserver keyserver.ubuntu.com --recv C3173AA6 \
+ && echo "deb http://ppa.launchpad.net/brightbox/ruby-ng/ubuntu trusty main" >> /etc/apt/sources.list \
  && apt-get update \
  && apt-get install -y supervisor logrotate locales \
       nginx openssh-server redis-tools mysql-client \
-      git-core postgresql-client ruby \
+      git-core postgresql-client ruby2.1 \
       python2.7 python-docutils \
       libmysqlclient18 libpq5 zlib1g libyaml-0-2 libssl1.0.0 \
       libgdbm3 libreadline6 libncurses5 libffi6 \

assets/setup/install

@@ -16,7 +16,7 @@ apt-get update
 
 # install build dependencies for gem installation
 apt-get install -y gcc g++ make patch pkg-config cmake \
-  libc6-dev ruby-dev \
+  libc6-dev ruby2.1-dev \
   libmysqlclient-dev libpq-dev zlib1g-dev libyaml-dev libssl-dev \
   libgdbm-dev libreadline-dev libncurses5-dev libffi-dev \
   libxml2-dev libxslt-dev libcurl4-openssl-dev libicu-dev