Simplify docker-composer setup

[mik-laj]

Hi,

Currently, the environment is recognized using the environment variable. However, it can be done more simply.

Regards,

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Preview this PR without the whitespace changes

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Checklist

• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows the standards laid out in the contributing
• Passes all existing automated tests
• New functions include new tests
• New functions are documented (with a description, list of inputs, and expected output)
• Project documentation has been updated (including the CHANGELOG)

[rafalgawlik]

👍

[kzuraw]

Thanks for the PR but I believe docker-componse setup is ok right now - see comment.

[kzuraw]

It can simplify this code a little bit but I'm worried that this feature is not documented in any way (officially) so it can easily change between docker versions. I would stick to the current solution.