Android Firebase App Distribution — On Kotlin DSL with Multiple BuildTypes support

Firebase screenshot

I’ve recently started a project where I wanted to use Firebase Distribution to send Alpha and Beta builds to the stakeholders.

I’ve used it dozens of times previously, so that seemed like a walk in the park… except this time I was using Kotlin DSL.

From the Firebase documentation ( read here ) I was doing something like:

plugins {
    id("com.android.application")
    kotlin("android")
    id("com.google.gms.google-services")
    id("com.google.firebase.crashlytics")
    id("com.google.firebase.firebase-perf")
    id("com.google.firebase.appdistribution")
}

android {
    namespace = "my.beautiful.app"
    compileSdk = Android.compileSdk

    defaultConfig {
        applicationId = "com.my.app"
        minSdk = Android.minSdk
        targetSdk = Android.compileSdk
        versionCode = 1 
        versionName = "1.0"
        }

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    signingConfigs {
        create("internal") {
            keyAlias = System.getenv("ANDROID_KEY_ALIAS")
            keyPassword = System.getenv("ANDROID_KEY_PASSWORD")
            storeFile = System.getenv("ANDROID_KEYSTORE_FILE")
            storePassword =…