Override the default npm registry for bun install

[install]
# set default registry as a string
registry = "https://registry.npmjs.org"

# if needed, set a token
registry = { url = "https://registry.npmjs.org", token = "123456" }

# if needed, set a username/password
registry = "https://usertitle:password@registry.npmjs.org"

[install]
registry = { url = "https://registry.npmjs.org", token = "$npm_token" }