Add LeakCanary to nighly builds

app/src/nightly/kotlin/org/koitharu/kotatsu/KotatsuApp.kt

@@ -1,5 +1,34 @@
 package org.koitharu.kotatsu
 
+import android.content.Context
+import android.content.SharedPreferences
+import androidx.preference.PreferenceManager
+import leakcanary.LeakCanary
 import org.koitharu.kotatsu.core.BaseApp
 
-class KotatsuApp : BaseApp()
+class KotatsuApp : BaseApp(), SharedPreferences.OnSharedPreferenceChangeListener {
+
+	override fun attachBaseContext(base: Context) {
+		super.attachBaseContext(base)
+		val prefs = PreferenceManager.getDefaultSharedPreferences(this)
+		configureLeakCanary(isEnabled = prefs.getBoolean(KEY_LEAK_CANARY, false))
+		prefs.registerOnSharedPreferenceChangeListener(this)
+	}
+
+	override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String?) {
+		if (key == KEY_LEAK_CANARY) {
+			configureLeakCanary(sharedPreferences.getBoolean(KEY_LEAK_CANARY, false))
+		}
+	}
+
+	private fun configureLeakCanary(isEnabled: Boolean) {
+		LeakCanary.config = LeakCanary.config.copy(
+			dumpHeap = isEnabled,
+		)
+	}
+
+	private companion object {
+
+		const val KEY_LEAK_CANARY = "debug.leak_canary"
+	}
+}