Using Bundler 2.0 during CI fails

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I made it work adding a new step that makes sure the right bundler version is used before building. The bundler version is obtained from the last line of the Gemfile.lock.

  - run:
      name: Configure Bundler
      command: |
        echo 'export BUNDLER_VERSION=$(cat Gemfile.lock | tail -1 | tr -d " ")' >> $BASH_ENV
        source $BASH_ENV
        gem install bundler
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