Release apk not working flutter

add a proguard file and fix it.

1. On your app level build.gradle add this to your buildTypes > release section
shrinkResources false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
2. Along the build.gradle file create a proguard-rules.pro file and add:
-keep class io.flutter.plugin.editing.** { *; }

Source: github.com

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