Successfully modified file: /home/Messier82/projects/service-book/app/build.gradle.kts (1 replacements). Here is the updated code:
...
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    testBuildType = "release"

    signingConfigs {
        create("release") {
            storeFile = rootProject.file("app/${keystoreProperties["storeFile"] ?: System.getenv("KEYSTORE_FILE") ?: ""}")
            storePassword = (keystoreProperties["storePassword"] ?: System.getenv("KEYSTORE_PASSWORD") ?: "").toString()
            keyAlias = (keystoreProperties["keyAlias"] ?: System.getenv("KEY_ALIAS") ?: "").toString()
...