fix(build): fallback to default debug signing config when debug.keystore is missing

app/build.gradle.kts

@@ -31,13 +31,16 @@ android {
         keyPassword = System.getenv("KEY_PASSWORD")
       }
     }
+    val localDebugKeystore = file("${rootDir}/debug.keystore")
+    if (localDebugKeystore.exists()) {
       create("debugConfig") {
-      storeFile = file("${rootDir}/debug.keystore")
+        storeFile = localDebugKeystore
         storePassword = "android"
         keyAlias = "androiddebugkey"
         keyPassword = "android"
       }
     }
+  }
 
   buildTypes {
     release {
@@ -45,10 +48,12 @@ android {
       isMinifyEnabled = false
       proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
       val releaseSigning = signingConfigs.findByName("release")
-      signingConfig = releaseSigning ?: signingConfigs.getByName("debugConfig")
+      val debugConfigSigning = signingConfigs.findByName("debugConfig")
+      signingConfig = releaseSigning ?: (debugConfigSigning ?: signingConfigs.getByName("debug"))
     }
     debug {
-      signingConfig = signingConfigs.getByName("debugConfig")
+      val debugConfigSigning = signingConfigs.findByName("debugConfig")
+      signingConfig = debugConfigSigning ?: signingConfigs.getByName("debug")
     }
   }
   compileOptions {