feat: Omit value in docker env vars if it is not set #232
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ErZimmermann
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When only the name without any value is provided for an environment variable in the metadata yaml of a step, currently the logic resolves this to
--env variable=to be passed to the docker container, which always results in the environment variable not being set. Instead, if no value is provided, the=should be omitted so the value is read from the environment in which the docker command is executed.