fix: Fix issue in the flake for building the release

android/app/src/main/AndroidManifest.xml

@@ -30,6 +30,10 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+
+        <meta-data
+            android:name="io.flutter.embedding.android.EnableImpeller"
+            android:value="true" />
     </application>
 
     <uses-permission android:name="android.permission.INTERNET" />

flake.nix

@@ -68,7 +68,7 @@
           --not-signed \
           --zipalign ${sdk}/share/android-sdk/build-tools/34.0.0/zipalign \
           --apksigner ${sdk}/share/android-sdk/build-tools/34.0.0/apksigner \
-          --provider-config ${providerArg} ${lib.optional skipBuild "--skip-build"}
+          --provider-config ${providerArg} ${lib.optionalString skipBuild "--skip-build"}
       '';
     in {
       # Skip the build and just sign