Add Dockerfile.ci and docker-compose.ci.yml

This provides a base image for CI systems to use.

Dockerfile.ci

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+FROM ubuntu:14.04
+MAINTAINER Alan Grosskurth <code@alan.grosskurth.ca>
+
+RUN \
+  locale-gen en_US.UTF-8 && \
+  apt-get update && \
+  env DEBIAN_FRONTEND=noninteractive apt-get -q -y install --no-install-recommends \
+    build-essential \
+    ca-certificates \
+    curl \
+    git-core \
+    libbz2-dev \
+    libcurl4-openssl-dev \
+    liblzma-dev \
+    libncurses5-dev \
+    libpq-dev \
+    libreadline-dev \
+    libssl-dev \
+    libxml2-dev \
+    libxslt1-dev \
+    pkg-config \
+    zlib1g-dev && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ENV \
+  PATH=/opt/local/python/bin:"$PATH"
+
+RUN \
+  mkdir -p /tmp/src /opt/local/python && \
+  cd /tmp/src && \
+  curl -fsLS -O https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tar.xz && \
+  curl -fsLS -O https://bootstrap.pypa.io/get-pip.py && \
+  echo '1cd3730781b91caf0fa1c4d472dc29274186480161a150294c42ce9b5c5effc0  Python-2.7.10.tar.xz' | sha256sum -c && \
+  tar -xJf Python-2.7.10.tar.xz && \
+  cd /tmp/src/Python-2.7.10 && \
+  env LDFLAGS='-Wl,-rpath=/opt/local/python/lib' \
+    ./configure --enable-shared --prefix=/opt/local/python && \
+  make && \
+  make install && \
+  ldconfig && \
+  cd /tmp/src && \
+  /opt/local/python/bin/python get-pip.py && \
+  cd /tmp && \
+  rm -rf /tmp/src
+
+WORKDIR /app

docker-compose.ci.yml

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+app:
+  build: .
+  dockerfile: Dockerfile.ci
+  volumes:
+    - ./:/app
+    - /usr/bin/buildkite-agent:/usr/bin/buildkite-agent
+  environment:
+    - BUILDKITE_AGENT_ACCESS_TOKEN
+    - BUILDKITE_JOB_ID
+    - BUILDKITE_BUILD_ID
+    - BUILDKITE_BUILD_NUMBER