fix(platform): load env vars in docker compose

[Bentlybro]

Summary

• DRY .env reference in Supabase docker-compose using YAML anchor

Testing

• poetry run format
• poetry run test (fails: FileNotFoundError: [Errno 2] No such file or directory: 'docker')
• yarn format
• yarn test (fails: Failed to fetch Poppins from Google Fonts)

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[Copilot]

Pull Request Overview

This PR aims to DRY the reference to the .env file in the Supabase Docker Compose configuration by introducing a YAML anchor.

• Introduces a top-level YAML anchor (x-envfile) to avoid repeated .env file configuration across services.
• Applies the merge key (<<: *env_file) to multiple service definitions to include the shared env_file configuration.

[majdyz]

What is it used for? should we include backend/.env too ?

[Bentlybro]

@majdyz this was an attempt to make it so docker reads and uses the proper .env files, i asked codex to help fix it, im going to test it and see if it works + yeah i can make it use backend/.env