Add Docker Compose development environment

Signed-off-by: Tom Duffield <tom@chef.io>

.gitignore

@@ -1,6 +1,7 @@
 *.gem
 *.rbc
 .bundle
+.docker_bundle
 .config
 .yardoc
 Gemfile.lock

Dockerfile

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+FROM ruby:2.3
+MAINTAINER Tom Duffield <tom@chef.io>
+
+# We need `git` because oftentimes .gemspec depends on it for listing files
+RUN apt-get update && \
+    apt-get install -y git && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN gem install bundler && mkdir /app
+COPY start /start
+WORKDIR /app
+CMD ["/start"]

Gemfile

@@ -1,3 +1,9 @@
 source "https://rubygems.org"
 
 gemspec
+
+group :docker do
+  gem "lita-slack"
+  gem "guard"
+  gem "guard-process"
+end

Guardfile

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+# Because we run Lita in a container, don't connect to STDIN
+interactor :off
+
+# Restart the lita CLI anytime we modify the lita_config or a lita file
+guard "process", name: "Lita", command: "bundle exec lita" do
+  watch("lita_config.rb")
+  watch(%r{^lib/*})
+end

docker-compose.yml

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+version: '3'
+services:
+  lita:
+    build: .
+    links:
+      - redis:redis
+    volumes:
+      # Sync all the local code to the app directory
+      - ./:/app
+      # Since we are syncing the whole directory, we need to make sure our local `.bundle` directory is not over-written
+      - ./.docker_bundle:/app/.bundle
+    environment:
+      - SLACK_TOKEN
+  redis:
+    image: redis

lita_config.rb

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+require "lita/adapters/slack"
+
+Lita.configure do |config|
+  config.robot.log_level = :debug
+  config.robot.adapter = :slack
+  config.robot.admins = ["1"]
+
+  # Use the redis host linked via docker-compose
+  config.redis[:host] = "redis"
+
+  config.adapters.slack.token = ENV["SLACK_TOKEN"]
+end

start

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+#!/bin/bash
+# This file is intended for use only in the Docker environment. If you wish to run Expeditor locally, please run
+#   bundle exec lita
+
+bundle install --path /var/bundle --jobs $(nproc) --clean
+
+exec bundle exec guard