ARG in Dockerfile⌗

The ARG instruction defines a variable that users can pass at build-time to the builder with the docker build command using the --build-arg <varname>=<value> flag. More details at docs.docker.com

Example⌗

Dockerfile

FROM debian:stable-slim

ARG HUGO_VERSION

LABEL maintainer "abskmj@gmail.com"
LABEL hugo.version ${HUGO_VERSION}

Pass the argument value

docker build -t hugo --build-arg HUGO_VERSION=0.69.0 .