Vercel：Vercel Sandbox现在支持在创建时接受环境变量

The Vercel Sandbox SDK and CLI now support setting environment variables at sandbox creation that are automatically available to every command.

When running multi-step processes in a Vercel Sandbox like installing dependencies, building a project or starting a dev server, each step often needs the same environment variables. Now, these are available with every runCommand call.

Environment variables passed to Sandbox.create() are inherited by all commands automatically. Per-command env in runCommand can still override individual values when needed.

Update to the latest Sandbox CLI and SDK, run npm i @vercel/sandbox to get started.