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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CONTAINER=beremiz_public_builder_current

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docker start $CONTAINER 

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echo exec docker with $*

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docker exec $CONTAINER bash -c "build $*"

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docker stop $CONTAINER

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