Motivation

Context: #15054 (comment)

We have a hard-coded list of countries in https://github.com/coder/coder/blob/main/site/src/pages/SetupPage/countries.tsx

This unfortunately means that the Go code in coder/coder doesn't have an easy way of utilizing it.

Proposed solution

Generate countries.tsx from Go code. This would entail modifying countries.tsx to Go syntax and using code generation to write countries.tsx.

This should be a relatively small lift as we have extensive code generation already in place. It could possibly be generated by scripts/apitypings.