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All code used on the article https://medium.com/@renatomefi/9fd8c620174
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Article-dockerfile-linting.md

Create a Dockerfile

FROM alpine:latest

Run

$ docker run --rm -i hadolint/hadolint < ./Dockerfile
/dev/stdin:1 DL3007 Using latest is prone to errors if the image will ever update. Pin the version explicitly to a release tag
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