Misc API Key Feature Updates

[aq-ikhwa-tech]

Proposed changes

• Add LOWCODER_API_SECRET_KEY env var for existing installations to work without having to rebuild images/containers
• (Good to have) Base64 encoded the secret key as per requirement of the function definition

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• Bugfix (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 not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
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Further comments

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