Add keystore conf, update logo

android/app/build.gradle

@@ -22,6 +22,12 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file('key.properties')
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace "store.zap.app"
     compileSdk flutter.compileSdkVersion
@@ -51,6 +57,15 @@ android {
         versionName flutterVersionName
     }
 
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword keystoreProperties['storePassword']
+        }
+    }
+
     buildTypes {
         release {
             // TODO: Add your own signing config for the release build.

android/app/src/main/AndroidManifest.xml

@@ -57,9 +57,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
     <uses-permission android:name="android.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION" />
-    <uses-permission
-        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        android:maxSdkVersion="29" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility?hl=en and