SNAP: replace lxml versions to be compatible with Beremiz.

Forcing ubuntu20 python-lxml (4.5.0) package instead of PIP vesrion (4.9.1).
4.9.1 leads to derived variable types to appear as "derived" instead of real type name.
Problem happens with plcopen/variables_infos.ysl2 and plcopen/VariableInfoCollector.py.
No clue for now about what really breaks.

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#!/bin/bash

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set -e

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OWNDIRBASENAME=$(basename $(cd $(dirname "${BASH_SOURCE[0]}") && pwd))

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echo "Building docker image"

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docker build \

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    --build-arg UID=$(id -u) \

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    --build-arg GID=$(id -g) \

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    --build-arg OWNDIRBASENAME="$OWNDIRBASENAME" \

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    -t beremiz_public_builder .

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