@SecretAntelope @selfhosting Ouch, in my experience that's a common one! You may find a Dockerfile linter, such as hadolint useful: https://github.com/hadolint/hadolint
It detects this specific issue as DL3007: https://github.com/hadolint/hadolint/wiki/DL3007
Happy hacking with #docker and #hadolint!

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