Deployed on Digital Ocean. Sorry, I think Google Cloud sucks
Therefore I started using a plain simple Digital Ocean droplet, an Mine simple deploy procedure, as explained in this tutorial
https://www.ralfebert.de/tutorials/rails-deployment/
Things you may want to cover:
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Ruby version: See gemfile
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System dependencies
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev software-properties-common libffi-dev nodejs nginx mysql-server mysql-common libmysqlclient-dev monit
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Configuration
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Database creation
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Database initialization
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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