Dockerize

docker/Dockerfile

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+FROM ruby:2.4.2-jessie
+
+# Clone sendgrid-ruby
+WORKDIR /sources
+RUN git clone https://github.com/sendgrid/sendgrid-ruby.git
+
+# Bundle
+WORKDIR /sources/sendgrid-ruby
+RUN bundle install
+
+# Install prism
+RUN curl https://raw.githubusercontent.com/stoplightio/prism/master/install.sh | sh

docker/README.md

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+# Docker image for sendgrid-ruby
+
+## Quickstart
+1. [Install Docker](https://docs.docker.com/engine/installation/) on your machine.
+2. Run `docker run --rm -it sendgrid/sendgrid-ruby irb`.
+3. Run `require './lib/sendgrid-ruby.rb'`.
+
+## Poke around
+
+If you would like to just poke around in the image and check some examples:
+```sh
+docker run --rm -it sendgrid/sendgrid-ruby bash
+```
+
+If you want to mount your fork or specific version of the gem:
+```sh
+docker run --rm -v /path/to/local/sendgrid-ruby:/sources/sendgrid-ruby -it sendgrid/sendgrid-ruby bash
+```
+
+## Running tests
+
+If you would like to run the tests present in the image:
+```sh
+docker run --rm sendgrid/sendgrid-ruby rake
+```
+
+If you want to run tests on your fork or a specific version, mount the codebase onto the image:
+```sh
+docker run --rm -v /path/to/local/sendgrid-ruby:/sources/sendgrid-ruby sendgrid/sendgrid-ruby rake
+```