include TRANSLATIONS_DIR as environment variable in the Docker image

RUN pip install \
    --pre \
    --extra-index-url https://artifactory.software.geant.org/artifactory/api/pypi/geant-swd-pypi/simple \
    --target=/app \
    geant-service-orchestrator==${ARTIFACT_VERSION}

ENV PYTHONPATH="/app:${PYTHONPATH}"

so with --target we can tell pip to install it in our mentioned dir

added 54 commits

• 15460b3e...57139e29 - 53 commits from branch develop
• 1f529bba - include TRANSLATIONS_DIR as environment variable in the Docker image

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• 8a2945df - update Dockerfile

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requested review from @mohammad.torkashvand

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• 523ea072 - apply some more common practices for Dockerfiles

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• fc0be1c4 - add an entrypoint for running the db migrations in runtime

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added 23 commits

• fc0be1c4...08e9f966 - 19 commits from branch develop
• a12dffef - include TRANSLATIONS_DIR as environment variable in the Docker image
• dbf7063f - update Dockerfile
• d483ea74 - apply some more common practices for Dockerfiles
• fb57ae23 - add an entrypoint for running the db migrations in runtime

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