Merge pull request #29 from turniere/ticket/TURNIERE-108

Create Dockerfile and Docker Rake tasks

.dockerignore

@@ -0,0 +1,11 @@
+.git
+test/**
+spec/**
+tmp/**
+.gitignore
+.hound.yml
+.rspec
+.rubocop.yml
+.travis-yml
+docker-compose.yml
+README.md

Dockerfile

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+FROM ruby:2.6.2-alpine
+RUN apk add build-base tzdata sqlite sqlite-dev && gem install tzinfo-data
+WORKDIR /app
+COPY Gemfile /app/Gemfile
+COPY Gemfile.lock /app/Gemfile.lock
+RUN bundle install --deployment --without development test
+COPY . /app
+ENV RAILS_ENV production
+CMD bundle exec rails db:migrate && bundle exec rails s -p 3000 -b 0.0.0.0

docker-compose.yml

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+version: "3"
+services:
+  app:
+    image: turniere/backend
+    ports:
+      - 3000:3000

lib/tasks/docker.rake

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+# frozen_string_literal: true
+
+IMAGE_NAME = 'turniere/backend'
+
+namespace :docker do
+  desc 'Build docker image'
+  task :build, [:tag] do |_, args|
+    args.with_defaults(tag: 'latest')
+    sh "docker build -t #{IMAGE_NAME}:#{args.tag} ."
+  end
+
+  desc 'Tag docker image with Travis build number'
+  task :tag do
+    next if ENV['TRAVIS_PULL_REQUEST'] != 'false'
+
+    tag = "build#{ENV['TRAVIS_BUILD_NUMBER']}"
+    sh "docker tag #{IMAGE_NAME} #{IMAGE_NAME}:#{tag}"
+  end
+
+  desc 'Push docker image'
+  task :push do
+    sh "docker push #{IMAGE_NAME}"
+  end
+
+  desc 'Run TravisCI tasks'
+  task travis: %i[build tag push] do
+  end
+end