Rails app tests, linters, and verifiers

• Rubocop — code style (see Preferences for Rubocop ruby formatting)
  • rubocop-rails
  • rubocop-rspec
  • rubocop-performance
  • rubocop-minitest
  • rubocop-md
  • rubocop-rake
  • rubocop-thread-safety
• bundler-audit - detect vulnerable gems (CVEs)
• n_plus_one_control - detect inefficient SQL (i.e. N+1 queries)
• brakeman - security vulnerability scanner based on static code analysis

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