Fix polling interval settings and add release build signing

- Fix polling interval not reflecting saved value (use SharingStarted.Eagerly)
- Add release build signing configuration with keystore
- Add key.properties to .gitignore for security
- Add ProGuard rules for JSpecify annotations

app/build.gradle.kts

@@ -1,3 +1,14 @@
+import java.util.Properties
+import java.io.FileInputStream
+
+// Load keystore properties
+val keystorePropertiesFile = rootProject.file("app/key.properties")
+val keystoreProperties = Properties()
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
@@ -6,35 +17,45 @@ plugins {
 }
 
 android {
-    namespace = "com.hotdeal.alarm"
-    compileSdk = 35
+ namespace = "com.hotdeal.alarm"
+ compileSdk = 35
 
-    defaultConfig {
-        applicationId = "com.hotdeal.alarm"
-        minSdk = 31
-        targetSdk = 35
-        versionCode = 1
-        versionName = "1.0.0"
+ defaultConfig {
+ applicationId = "com.hotdeal.alarm"
+ minSdk = 31
+ targetSdk = 35
+ versionCode = 1
+ versionName = "1.0.0"
 
-        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-        vectorDrawables {
-            useSupportLibrary = true
-        }
-    }
+ testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+ vectorDrawables {
+ useSupportLibrary = true
+ }
+ }
 
-    buildTypes {
-        release {
-            isMinifyEnabled = true
-            isShrinkResources = true
-            proguardFiles(
-                getDefaultProguardFile("proguard-android-optimize.txt"),
-                "proguard-rules.pro"
-            )
-        }
-        debug {
-            isMinifyEnabled = false
-        }
-    }
+ signingConfigs {
+ create("release") {
+ keyAlias = keystoreProperties["keyAlias"] as String?
+ keyPassword = keystoreProperties["keyPassword"] as String?
+ storeFile = keystoreProperties["storeFile"]?.let { file("$it") }
+ storePassword = keystoreProperties["storePassword"] as String?
+ }
+ }
+
+ buildTypes {
+ release {
+ isMinifyEnabled = true
+ isShrinkResources = true
+ proguardFiles(
+ getDefaultProguardFile("proguard-android-optimize.txt"),
+ "proguard-rules.pro"
+ )
+ signingConfig = signingConfigs.getByName("release")
+ }
+ debug {
+ isMinifyEnabled = false
+ }
+ }
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17