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Dockerfileのstage nameが読み込めない!

Posted at
ターミナル
docker build .

実行時に

ターミナル
failed to solve with frontend dockerfile.v0: failed to create LLB definition: failed to parse stage name "ruby:": invalid reference format

というエラーが発生しました。

そこでDockerfileを確認してみると、

Dockerfile
FROM ruby:$RUBY_VERSION

というふうにrubyのversionが書かれていなかったため、

Dockerfile
FROM ruby:3.02

と記述するとエラーが解消しました。

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