fix: build check on PRs: skip singned apk build

Author: Surjit Kumar Sahoo

app/build.gradle.kts

@@ -89,7 +89,12 @@ android {
 
   buildTypes {
     release {
-      signingConfig = signingConfigs.getByName("release")
+      val releaseSigningConfig = signingConfigs.getByName("release")
+
+      if (releaseSigningConfig.storeFile?.exists() == true) {
+        signingConfig = releaseSigningConfig
+      }
+
       isMinifyEnabled = true
       isShrinkResources = false
       proguardFiles(