heroku-20 【解決】heroku-20 You are trying to install ruby-2.6.5 on heroku-20. The Ruby version you are trying to install does not exist on this stack.Herokuheroku-20versionデプロイRubyRuby
【解決】heroku-20 You are trying to install ruby-2.6.5 on heroku-20. The Ruby version you are trying to install does not exist on this stack.Herokuheroku-20versionデプロイRubyRuby
