You would get an error if there is bundler's version difference between BUNDLED WITH in Gemfile.lock and the installed bundler.
https://dev.to/tan...
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It works. I just had to change the Gemfile.lock COPY command
When running a fresh project Gemfile.lock is not generated to the way to copy in Docker a non-existing file is with
.*COPY Gemfile.* $APP_HOME/Gemfile.*