This README would normally document whatever steps are necessary to get the application up and running.
Reference:
https://tmasuyama1114.com/docker-compose-rails6-mysql-development https://blog.devgenius.io/testing-a-rails-api-with-rspec-82dedc9f15df
Things you may want to cover:
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Ruby version
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System dependencies
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Configuration docker compose up -d
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Database creation docker-compose run web rails db:create rails db:create
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Database initialization rails db:migrate
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How to run the test suite
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Services (job queues, cache servers, search engines, etc.)
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Deployment instructions
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...