Merge branch 'mnowak/add-cleanup_file_variables-stage' into 'main'

Add "cleanup_file_variables" stage

See merge request !7
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passed #1405395
linux docker amd64
flake8

00:00:08

passed #1405396
linux docker amd64
pylint

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passed #1405397
linux docker amd64
shellcheck

00:00:08