Credentials Cheat Sheet:
https://blog.corsego.com/ruby-on-rails-6-credentials-tldr
Official Docs:
https://edgeguides.rubyonrails.org/security.html#custom-credentials
0:00 The Problem
01:25 editing and displaying credentials
09:25 different environment credentials
12:32 credentials in production (heroku)
15:12 CHEAT SHEET
16:59 credential files for different environments
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