Custom-domain commands refuse a production branch that is not named production or main #292

The CLI decides whether a branch is the production branch by its name, not its role. toBranchKind in packages/cli/src/commands/service/target.ts returns production only for a branch named production or main, and the domain commands then refuse any other branch.

A project whose production branch has another name cannot manage custom domains. The API's branch record already carries a role field (read in packages/cli/src/lib/app/app-provider.ts), so the check can use it instead of the name.

Recorded in the prisma-cli-v8 project ledger, which is being deleted at project close-out:

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