heroku にデプロイできない

かなり長いこと herokuにデプロイできなくて苦しんだ。

開発環境

ruby 2.6.5
Ruby on Rails 5.2.5
bundler 2.2.16

エラー内容　

heroku にデプロイする際に下記のエラーが発生

remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.6
remote: -----> Installing dependencies using bundler 2.2.16
remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
remote:        Your bundle only supports platforms ["x86_64-darwin-19"] but your local platform
remote:        is x86_64-linux. Add the current platform to the lockfile with `bundle lock
remote:        --add-platform x86_64-linux` and try again.
remote:        Bundler Output: Your bundle only supports platforms ["x86_64-darwin-19"] but your local platform
remote:        is x86_64-linux. Add the current platform to the lockfile with `bundle lock
remote:        --add-platform x86_64-linux` and try again.
remote: 
remote:  !
remote:  !     Failed to install gems via Bundler.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !	Push rejected to infinite-bayou-54822.
remote: 
To https://git.heroku.com/infinite-bayou-54822.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/infinite-bayou-54822.git'

解決策

　push 前にターミナル上で以下のコマンドを入力

$ git add -A
$ git commit -m 'Add platform'
$ git push heroku master

これだけいけた

最初はいろいろと調査していくなかで

remote:  !     Failed to install gems via Bundler.

ここが悪いと思い bundler の様々なバージョンをためしたが、

どうやら僕の場合は

remote:        Your bundle only supports platforms ["x86_64-darwin-19"] but your local platform
remote:        is x86_64-linux. Add the current platform to the lockfile with `bundle lock

ここが悪かったよう。

ちなみに heroku-20 です。

参考にさせていただいた記事は以下