fixes in gradle files

defaultAndroidSettings

@@ -12,6 +12,9 @@ android {
         release {
             minifyEnabled false
         }
+        debug {
+            debuggable true
+        }
     }
 
     packagingOptions {
@@ -28,4 +31,8 @@ android {
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_1_8.toString()
     }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
 }

mppAndroidProject

@@ -4,7 +4,9 @@ project.group = "$group"
 apply from: "$publishGradlePath"
 
 kotlin {
-    android {}
+    android {
+        publishAllLibraryVariants()
+    }
 
     sourceSets {
         commonMain {

mppProjectWithSerialization

@@ -10,7 +10,7 @@ kotlin {
         nodejs()
     }
     android {
-        publishLibraryVariants("release")
+        publishAllLibraryVariants()
     }
 
     sourceSets {