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/src/main/AndroidManifest.xml

@@ -15,7 +15,7 @@
         android:allowBackup="false"
         android:banner="@drawable/banner"
         android:icon="@drawable/icon"
-        android:label="Grafana Kiosk"
+        android:label="@string/app_name"
         android:usesCleartextTraffic="true"
         android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
 

app/src/main/java/cz/c3c/webviewkiosk/MainActivity.kt

@@ -15,11 +15,6 @@ import android.webkit.WebViewClient
 
 class MainActivity : Activity() {
 
-    companion object {
-        const val DASHBOARD_URL =
-            "https://grafana.c3c.cz/public-dashboards/381fe3e71e164eb99dd0b10e246a36e2"
-    }
-
     private lateinit var webView: WebView
     private val handler = Handler(Looper.getMainLooper())
     private val backoff = BackoffPolicy(initialDelayMs = 2_000, maxDelayMs = 60_000)
@@ -55,7 +50,7 @@ class MainActivity : Activity() {
                 if (!request.isForMainFrame) return
                 lastLoadFailed = true
                 handler.postDelayed(
-                    { view.loadUrl(DASHBOARD_URL) },
+                    { view.loadUrl(BuildConfig.DASHBOARD_URL) },
                     backoff.nextDelayMs(),
                 )
             }
@@ -63,7 +58,7 @@ class MainActivity : Activity() {
 
         setContentView(webView)
         hideSystemUi()
-        webView.loadUrl(DASHBOARD_URL)
+        webView.loadUrl(BuildConfig.DASHBOARD_URL)
     }
 
     override fun onResume() {