Android Project BuildType
https://developer.android.com/studio/build/build-variants?hl=ko
https://seosh817.tistory.com/285
https://develop-hong.tistory.com/6
https://stackoverflow.com/questions/30796533/how-to-generate-buildconfigfield-with-string-type
https://mond-al.github.io/productflavors-buildtype-combine
https://developer.android.com/codelabs/build-variants?hl=ko#2
https://github.com/skydoves/chatgpt-android/blob/main/app/build.gradle.kts
https://github.com/nohjunh