Add Docker support

.dockerignore

@@ -0,0 +1,28 @@
+.git
+Dockerfile
+.dockerignore
+
+*.gem
+*.rbc
+.bundle
+.config
+coverage
+InstalledFiles
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+*.DS_STORE
+build/
+.cache
+.vagrant
+.sass-cache
+
+# YARD artifacts
+.yardoc
+_yardoc
+doc/
+.idea/

Dockerfile

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+FROM ruby:2.3-alpine
+
+MAINTAINER  Sharetribe Team <[email protected]>
+
+RUN apk add --update nodejs g++ make
+
+# Add user for running the app
+RUN adduser -D app
+
+COPY Gemfile Gemfile.lock /opt/app/
+WORKDIR /opt/app
+USER app
+RUN bundle install
+
+COPY . /opt/app
+USER root
+RUN chown -R app:app /opt/app
+USER app
+
+EXPOSE 4567
+
+CMD ["bundle", "exec", "middleman", "server", "--watcher-force-polling"]

docker-compose.yml

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+app:
+  build: .
+  ports:
+    - 4567:4567
+  volumes:
+    - ./source:/opt/app/source