Adds Docker support for running linters workers

.dockerignore

@@ -0,0 +1,9 @@
+.git
+.foreman
+.bundle
+db/*.sqlite3
+log/*.log
+tmp
+.env.local
+dump.rdb
+node_modules

Dockerfile

@@ -0,0 +1,39 @@
+FROM ruby:2.4.1
+
+RUN apt-get update && apt-get install -y apt-transport-https \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Add node source
+RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
+RUN echo 'deb https://deb.nodesource.com/node_8.x jessie main' > /etc/apt/sources.list.d/nodesource.list
+RUN echo 'deb-src https://deb.nodesource.com/node_8.x jessie main' >> /etc/apt/sources.list.d/nodesource.list
+
+# Add yarn source
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+RUN echo 'deb https://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  locales \
+  nodejs \
+  yarn \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US.UTF-8
+ENV LC_ALL en_US.UTF-8
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY Gemfile /usr/src/app/
+COPY Gemfile.lock /usr/src/app/
+RUN bundle install
+
+COPY package.json /usr/src/app/
+COPY yarn.lock /usr/src/app/
+RUN yarn
+
+COPY . /usr/src/app
+
+CMD bundle exec rake jobs:work

package.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Use Node for JS based linters",
   "engines": {
-    "node": "8.4.0"
+    "node": "^8.4.0"
   },
   "dependencies": {
     "babel-eslint": "^8.0.1",