fix: set DEPLOY_ID and DEPLOY_URL env vars once available

[Skn0tt]

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Summary

Resolves https://linear.app/netlify/issue/COM-426/deploy-url-doesnt-update-when-deploying-locally-via-cli

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📊 Benchmark results

Comparing with edbfbb4

• Dependency count: 1,312 (no change)
• Package size: 294 MB ⬆️ 0.00% increase vs. edbfbb4
• Number of ts-expect-error directives: 1,016 ⬇️ 0.10% decrease vs. edbfbb4