Chore/improve local testing dx INTER-111

[JuroUhlar]

• Document how to test locally
• Load variables from env file
• Provide env file example
• Allow specifying region in env file
• Supress warnings, print result

[github-actions[bot]]

This PR will not create a new release :rocket:

[ilfa]

:tada: This PR is included in version 2.1.0 :tada:

The release is available on GitHub release

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