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Created November 13, 2015 22:41
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Dockerfile
...
# Create a folder, and only copy the Gemfile and Gemfile.lock
RUN mkdir /mnt/somerville-teacher-tool
COPY Gemfile /mnt/somerville-teacher-tool/Gemfile
COPY Gemfile.lock /mnt/somerville-teacher-tool/Gemfile.lock
# Now run bundle install. This step will only be invalidated
# if the Gemfile or Gemfile.lock changes.
RUN bundle install
# And further setup, like copying in source code, can go here
# and Docker can rebuild from this point without having to run
# `bundle install` again.
COPY . /mnt/somerville-teacher-tool
...
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