Integration test (#14)

- Uses docker to put everything together.
- stack is running on "raw" system, similar to MacOS build.

ci_build/Dockerfile

@@ -0,0 +1,35 @@
+# Image for launching TensorFlow Haskell tests.  Unlike the
+# development image in docker/Dockerfile, this one doesn't require
+# stack to be installed on the host.  This comes at the expense of
+# flexibility.
+
+FROM tensorflow/tensorflow:nightly-devel
+MAINTAINER TensorFlow authors <tensorflow-haskell@googlegroups.com>
+
+# The build context directory is the top of the tensorflow-haskell
+# tree.
+ADD . /tfhs
+WORKDIR /tfhs
+
+RUN \
+    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 575159689BEFB442 && \
+    echo 'deb http://download.fpcomplete.com/ubuntu trusty main'| tee /etc/apt/sources.list.d/fpco.list && \
+    apt-get update && \
+    apt-get install -y \
+        # Avoids /usr/bin/ld: cannot find -ltinfo
+        libncurses5-dev \
+        # Makes stack viable in the container
+        libgmp-dev \
+        libcurl3-dev \
+        stack && \
+    git submodule init && git submodule update && \
+    # Installs protoc and the libraries.
+    ( cd third_party/tensorflow && \
+      tensorflow/tools/ci_build/builds/configured CPU && \
+      bazel build -c opt '@protobuf//:protoc' && \
+      install -s bazel-bin/external/protobuf/protoc /usr/local/bin && \
+      bazel build -c opt '//tensorflow:libtensorflow_c.so' && \
+      install bazel-bin/tensorflow/libtensorflow_c.so /usr/local/lib && \
+      ldconfig ) && \
+    stack setup && \
+    stack test --only-dependencies

ci_build/outer_launch_tests.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# Builds a test image and runs the tests inside.
+
+set -eu -o pipefail
+
+IMAGE_NAME=tensorflow/haskell/ci_build:v0
+
+git submodule update
+docker build -t $IMAGE_NAME -f ci_build/Dockerfile .
+docker run -ti  $IMAGE_NAME stack test

docker/Dockerfile

@@ -9,6 +9,7 @@ RUN \
     install -s bazel-bin/external/protobuf/protoc /usr/local/bin && \
     bazel --batch build -c opt '//tensorflow:libtensorflow_c.so' && \
     install bazel-bin/tensorflow/libtensorflow_c.so /usr/local/lib && \
+    ldconfig && \
     bazel --batch clean
 
 RUN apt-get update