In a julia REPL you can type ENV; a dictionary will be printed with all the environment variables.
If you want to add a new environment variable in the current Julia process type in REPL: ENV["JULIA_CUDA_USE_BINARYBUILDER"] = false
Otherwise you can simply go in Windows Environment variables window, add a new variable called JULIA_CUDA_USE_BINARYBUILDER and put false in the value field.
Indeed there is a way to set this at Julia startup but I’m also struggling with it.