hadolint/DL3006

Always tag the version of an image explicitly.

Description

You can never rely that the latest tag is a specific version. Always tag the version of an image explicitly to ensure reproducible builds.

FROM debian

FROM debian:jessie

When the image name refers to a previously defined alias, tagging is not required:

FROM debian:jessie as build
RUN build_script

FROM build as tests
RUN test_script

FROM debian:jessie
COPY --from=build foo .