Merge remote-tracking branch 'yarnpkg/master' into issue-2600

Dockerfile.dev

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+# Dockerfile for building Yarn.
+# docker build -t yarnpkg/dev -f Dockerfile.dev .
+
+FROM yarnpkg/node-yarn:latest
+MAINTAINER Daniel Lo Nigro <yarn@dan.cx>
+
+# Debian packages
+RUN apt-get -y update && \
+  apt-get install -y --no-install-recommends \
+    fakeroot \
+    lintian \
+    rpm \
+    ruby \
+    ruby-dev \
+    unzip \
+  && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/*
+
+# Ruby packages
+RUN gem install fpm
+
+### Custom apps
+# ghr (just needed for releases, could probably be optional)
+ADD https://github.com/tcnksm/ghr/releases/download/v0.5.0/ghr_v0.5.0_linux_amd64.zip /tmp/ghr.zip
+RUN unzip /tmp/ghr.zip -d /usr/local/bin/ && rm /tmp/ghr.zip

Dockerfile.node7

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+# Dockerfile for using Yarn along with Node.js 7.x
+# docker build -t yarnpkg/node-yarn:latest -f Dockerfile.node7 .
+
+FROM node:7
+MAINTAINER Daniel Lo Nigro <yarn@dan.cx>
+
+ADD https://dl.yarnpkg.com/debian/pubkey.gpg /tmp/yarn-pubkey.gpg
+RUN apt-key add /tmp/yarn-pubkey.gpg && rm /tmp/yarn-pubkey.gpg
+RUN echo "deb http://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
+
+RUN apt-get -y update && \
+  apt-get install -y --no-install-recommends yarn && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/*