Set unique applicationIdSuffix in debug builds

app/build.gradle

@@ -20,6 +20,9 @@ android {
     }
 
     buildTypes {
+        debug {
+	        applicationIdSuffix ".debug"
+        }
         release {
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

app/src/debug/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_launcher_name">File Manager_debug</string>
+</resources>