bugfix: add new line to .env creation step

[vicradon]

This new line addition ensures that environment variables not defined in the app-sample.env get preppended with new lines before they are added

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Description

1. I ensured that I prepend a new line before each new field that is to be added to the .env file in the deploy_app script
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Related Issue (Link to Github issue)

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How Has This Been Tested?

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Screenshots (if appropriate - Postman, etc):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.