Make Showkase browser work in the nightly versions (#829)

libraries/designsystem/build.gradle.kts

@@ -27,6 +27,13 @@ android {
         buildConfig = true
     }
 
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = true
+            consumerProguardFiles("proguard-rules.pro")
+        }
+    }
+
     dependencies {
         api(projects.libraries.theme)
         // Should not be there, but this is a POC

libraries/designsystem/proguard-rules.pro

@@ -19,3 +19,5 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+-keep class io.element.android.libraries.designsystem.showkase.DesignSystemShowkaseRootModuleCodegen { }