Updated Dickerfile

* Bumped Ruby to 2.4.2
* Shrank image 2.4x
  * Removed git that is only used for docs
  * Removed test gems

Author: pointlessone

Dockerfile

@@ -1,18 +1,18 @@
-FROM ruby:2.3-alpine
+FROM ruby:2.4-alpine
 
 WORKDIR /usr/src/app
-COPY Gemfile /usr/src/app/
-COPY Gemfile.lock /usr/src/app/
 
-RUN gem install bundler && \
-    bundle install -j 4 && \
-    rm -fr /usr/share/ri
+RUN adduser -u 9000 -D app
 
-RUN apk --update add git
+COPY Gemfile Gemfile.lock /usr/src/app/
+
+RUN gem install bundler && \
+    bundle install -j 4 --without=test && \
+    chown -R app:app /usr/local/bundle && \
+    rm -fr ~/.gem ~/.bundle ~/.wh..gem
 
-RUN adduser -u 9000 -D app
 COPY . /usr/src/app
-RUN chown -R app:app /usr/src/app
+RUN chown -R app:app .
 
 USER app
 

Makefile

@@ -6,11 +6,11 @@ image:
 	docker build --rm -t $(IMAGE_NAME) .
 
 test: image
-	docker run --rm $(IMAGE_NAME) sh -c "cd /usr/src/app && bundle exec rake"
+	docker run --rm $(IMAGE_NAME) sh -c "cd /usr/src/app && bundle install --with=test && bundle exec rake"
 
 docs: image
 	docker run --rm \
 		--user root \
 		--workdir /usr/src/app \
 		--volume $(PWD):/usr/src/app \
-		$(IMAGE_NAME) sh -c "bundle exec rake docs:scrape"
+		$(IMAGE_NAME) sh -c "apk --update add git && bundle exec rake docs:scrape"

Rakefile

@@ -1,7 +1,11 @@
 # frozen_string_literal: true
 
-require "rspec/core/rake_task"
-
 Rake.add_rakelib "lib/tasks"
-RSpec::Core::RakeTask.new(:spec)
-task default: :spec
+
+begin
+  require "rspec/core/rake_task"
+
+  RSpec::Core::RakeTask.new(:spec)
+  task default: :spec
+rescue LoadError
+end