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Support multiple alpine versions in Dockerfile
Add an ARG to the Dockerfile to support passing in build-args when running docker build to support different alpine base image versions.
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FROM alpine:latest
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ARG ALPINE_VERSION=latest
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FROM alpine:${ALPINE_VERSION}
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LABEL maintaner="Bojan Cekrlic - https://github.com/bokysan/docker-postfix/"
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# See README.md for details
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