IOS build upload error when url scheme is read from .env

[Kiran0791]

When the url scheme is read from the .env file build is succesfull but when uploading package to appstore its throwing the following error
ERROR ITMS-90158: "The following URL schemes found in your app are not in the correct format: [__RN_CONFIG_FACEBOOK_CUSTOM_URL_SCHEME]. URL schemes need to begin with an alphabetic character, and be comprised of alphanumeric characters, the period, the hyphen or the plus sign only. Please see RFC1738 for more detail."

code .env
FACEBOOK_CUSTOM_URL_SCHEME="fb*********"

on info.plist
```

<key>CFBundleURLSchemes</key>
			<array>
				<string>__RN_CONFIG_FACEBOOK_CUSTOM_URL_SCHEME</string>
			</array>