refactor: Next env loading

[vicb]

• move the generated file to an env folder
• use a local variable to load once (vs a key of process.env)

[changeset-bot]

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Latest commit: ec64d50

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/@opennextjs/cloudflare@337

commit: ec64d50

[vicb]

Thanks James!