T-60 Docker Setup

.dockerignore

@@ -0,0 +1 @@
+Gemfile.lock

README.md

@@ -227,6 +227,15 @@ Bug reports and pull requests are welcome on GitHub at https://github.com/marian
 
 * Update docs: `bundle exec sdoc lib -T rails -o docs`.
 
+## Development with Docker
+
+* Build container `docker build . -f docker/Dockerfile-2.3 -t basic_temperature_2.3`.
+
+* Run specs inside container `docker run -it basic_temperature_2.3:latest bundle exec rspec`.
+
+* Interactive shell inside container `docker run -it basic_temperature_2.3:latest bash`.
+* 2.3 can be replaced by 2.4, 2.5, 2.6 and 2.7.
+
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).

docker/Dockerfile-2.3

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+FROM ruby:2.3
+
+RUN mkdir -p /gem
+WORKDIR /gem
+
+COPY . /gem
+RUN bundle install

docker/Dockerfile-2.4

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+FROM ruby:2.4
+
+RUN mkdir -p /gem
+WORKDIR /gem
+
+COPY . /gem
+RUN bundle install

docker/Dockerfile-2.5

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+FROM ruby:2.5
+
+RUN mkdir -p /gem
+WORKDIR /gem
+
+COPY . /gem
+RUN bundle install

docker/Dockerfile-2.6

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+FROM ruby:2.6
+
+RUN mkdir -p /gem
+WORKDIR /gem
+
+COPY . /gem
+RUN bundle install

docker/Dockerfile-2.7

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+FROM ruby:2.7
+
+RUN mkdir -p /gem
+WORKDIR /gem
+
+COPY . /gem
+RUN bundle install