https://medium.com/dipien/install-your-debug-release-variants-on-the-same-device-be506916933f

AppUtils.kt

object AppUtils {
  
    // The package name of the application
    const val manifestPackageName = "com.example.myapp"

    // The application id of the application
    val applicationId: String
        get() {
            val context = ...
             // You could receive the context as parameter here 
            // or obtain from a any context container of your app
            return context.applicationContext.packageName
        }

    // The application id of the application on release mode. 
    // This method removes the .debug suffix
    val releaseApplicationId: String by lazy {
        val buildType = BuildConfig.BUILD_TYPE
        return@lazy if (buildType == "release") {
            applicationId
        } else {
            applicationId.replace(".${buildType}", "")
        }
    }
}