Unpin static version in Dockerfile

[nickrusso42518]

ARG VERSION
FROM openjdk:8-jre-alpine
LABEL maintainer="njrusmc@gmail.com"

# Download the specific VTL release, unzip it, and delete the original zip.
RUN wget https://github.com/plavjanik/vtl-cli/releases/download/v${VERSION}/vtl.zip && \
    unzip vtl.zip && \
    rm -f vtl.zip

# Copy the sample directory into the container.
COPY sample /sample

VERSION=0.1.1 docker build --build-arg VERSION=$VERSION -t .../vtlcli:$VERSION .

[nickrusso42518]

Reference: https://gitlab.com/dmfigol/base-docker-images/blob/master/python/Dockerfile-alpine

[nickrusso42518]

Note ARG has to come after the FROM statement in this case, as the args get wiped out after the importation of the base image.

Reference: moby/moby#34129