feat: multi-flavor APK build from dashboards.yaml

Dashboard URL and label configured in dashboards.yaml; each entry
becomes a product flavor with BuildConfig.DASHBOARD_URL injected
at build time. APKs output as <flavor>-release.apk.

app/build.gradle.kts

@@ -1,8 +1,14 @@
+import org.yaml.snakeyaml.Yaml
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
 }
 
+@Suppress("UNCHECKED_CAST")
+val dashboards: Map<String, Map<String, String>> =
+    Yaml().load(rootProject.file("dashboards.yaml").inputStream())
+
 android {
     namespace = "cz.c3c.webviewkiosk"
     compileSdk = 34
@@ -15,11 +21,12 @@ android {
         versionName = "0.1.0"
     }
 
+    buildFeatures {
+        buildConfig = true
+    }
+
     signingConfigs {
         create("release") {
-            // Keystore is committed (private repo, LAN kiosk app) so every
-            // machine/CI produces the same signature and `adb install -r`
-            // upgrades work without uninstalling. Created in Task 6.
             storeFile = rootProject.file("signing/release.keystore")
             storePassword = "android-webview-kiosk"
             keyAlias = "kiosk"
@@ -34,6 +41,28 @@ android {
         }
     }
 
+    flavorDimensions += "dashboard"
+
+    productFlavors {
+        dashboards.forEach { (name, config) ->
+            create(name) {
+                dimension = "dashboard"
+                buildConfigField("String", "DASHBOARD_URL", "\"${config["url"]}\"")
+                resValue("string", "app_name", config["label"] ?: name)
+            }
+        }
+    }
+
+    @Suppress("DEPRECATION")
+    applicationVariants.all {
+        val flavor = productFlavors.first().name
+        val type = buildType.name
+        outputs.all {
+            (this as com.android.build.gradle.internal.api.BaseVariantOutputImpl)
+                .outputFileName = "$flavor-$type.apk"
+        }
+    }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17