(maint) Add ability to build a Docker image.

Adds a dockerfile for the mono choco build.
Adds the wrapper Bash script for easier choco commands in the container.
Stores assets in a docker subfolder.
Adds documentation on how to build the image yourself.

docker/Dockerfile.linux

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+FROM mono:3.12.1
+
+MAINTAINER Justin Phelps <[email protected]>
+
+COPY . /usr/local/src/choco/
+
+WORKDIR /usr/local/src/choco
+RUN chmod +x build.sh
+RUN chmod +x zip.sh
+RUN ./build.sh
+
+WORKDIR /usr/local/bin
+RUN ln -s /usr/local/src/choco/build_output/chocolatey
+
+COPY docker/choco_wrapper /usr/local/bin/choco
+
+WORKDIR /root

docker/README.md

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+Building Docker Image
+=====================
+
+This directory contains the necessary Dockerfile and wrapper script for building a Docker Image. This is a Linux based image that builds and runs choco.exe with mono.
+
+To build this image yourself, follow these steps:
+
+1. Clone down the repository using `git clone https://github.com/chocolatey/choco.git`.
+1. Change directories to the root of the repository.
+1. Run the docker build command. `docker build -t mono-choco -f docker/Dockerfile.linux .` (the trailing . is important)
+1. Run your new image using the command `docker run -ti --rm mono-choco /bin/bash`
+1. Test choco by running `choco -h`. You should see the help message from choco.exe.

docker/choco_wrapper

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+#!/bin/bash
+
+mono /usr/local/bin/chocolatey/choco.exe "$@" --allow-unofficial