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HerokuにDockerコンテナpush時に「Error: docker push exited with Error: 1」というエラー

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##背景

HerokuにDockerコンテナを以下ターミナルコマンドでpushしようとしたところ、後述するエラーに直面した。

heroku container:push web

##エラー文

unauthorized: authentication required
 ▸    Error: docker push exited with Error: 1

##解決策

以下コマンドでコンテナにログインした上で最初のコマンドを実行したら、無事にpushが完了した。

heroku container:login

##追記
pushが完了したら、下記コマンドでリリースをしよう。

heroku container:release web

リリースが完了したら、下記コマンドでアプリを開いてみよう。

heroku open

##参考
https://zenn.dev/masa20210102/articles/e602a155ff7bf0

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