修复apk build error

android/app/build.gradle.kts

@@ -30,6 +30,14 @@ if (keystorePropertiesFile.exists()) {
     keystoreProperties.load(FileInputStream(keystorePropertiesFile))
 }
 
+val releaseStoreFile = keystoreProperties.getProperty("storeFile")?.let { rootProject.file(it) }
+val hasReleaseSigning = listOf(
+    "keyAlias",
+    "keyPassword",
+    "storePassword",
+).all { !keystoreProperties.getProperty(it).isNullOrBlank() } &&
+    releaseStoreFile?.exists() == true
+
 android {
     namespace = "com.limo.cloudreve4_flutter"
     compileSdk = getLocalProperty("flutter.compileSdkVersion", 36)
@@ -38,10 +46,12 @@ android {
     // 2. 配置签名选项
     signingConfigs {
         create("release") {
-            keyAlias = keystoreProperties["keyAlias"] as String?
-            keyPassword = keystoreProperties["keyPassword"] as String?
-            storeFile = keystoreProperties["storeFile"]?.let { file(it) }
-            storePassword = keystoreProperties["storePassword"] as String?
+            if (hasReleaseSigning) {
+                keyAlias = keystoreProperties.getProperty("keyAlias")
+                keyPassword = keystoreProperties.getProperty("keyPassword")
+                storeFile = releaseStoreFile
+                storePassword = keystoreProperties.getProperty("storePassword")
+            }
         }
     }
 
@@ -86,7 +96,7 @@ android {
     buildTypes {
         release {
             // 1. 将原来的 getByName("debug") 替换为 getByName("release")
-            signingConfig = signingConfigs.getByName("release")
+            signingConfig = signingConfigs.getByName(if (hasReleaseSigning) "release" else "debug")
             
             // 2. 建议同时开启混淆，这能大幅减小网盘应用的体积并保护代码
             isMinifyEnabled = true

android/gradle.properties

@@ -1,2 +1,6 @@
-org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+org.gradle.jvmargs=-Xmx3072m -XX:MaxMetaspaceSize=1G -XX:ReservedCodeCacheSize=256m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+org.gradle.workers.max=2
+org.gradle.vfs.watch=false
+kotlin.compiler.execution.strategy=in-process
+kotlin.incremental=false
 android.useAndroidX=true