Show how to set build environment variables in wrangler.toml

[rgbkrk]

Proposed changes

• https://developers.cloudflare.com/workers/ci-cd/builds/configuration/#environment-variables

Subject Matter

Environment Variables for Builds in wrangler

Content Location

https://developers.cloudflare.com/workers/ci-cd/builds/configuration/#environment-variables

Additional information

I'd love to be able to set the build environment variables in the wrangler.toml.