Document the server build process

[matthewp]

This documents the server build process to explain the steps and which environments get built in which order and why.

Testing

N/A

[changeset-bot]

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Latest commit: c127979

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[github-actions]

⚠️ Package Trust Level Decreased

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Decreased trust levels may indicate a higher risk of supply chain attacks. Please review these changes carefully.

📦 Package	🔒 Before	🔓 After
@cloudflare/unenv-preset	trusted-with-provenance	none
workerd	trusted-with-provenance	none
undici	provenance	none
miniflare	trusted-with-provenance	none
youch	provenance	none
@cloudflare/workerd-darwin-64	trusted-with-provenance	none
@cloudflare/workerd-darwin-arm64	trusted-with-provenance	none
@cloudflare/workerd-linux-64	trusted-with-provenance	none
@cloudflare/workerd-linux-arm64	trusted-with-provenance	none
@cloudflare/workerd-windows-64	trusted-with-provenance	none
wrangler	trusted-with-provenance	none