fix: build wallet_app example with java 21 (#437)

* CI: add job to build examples/wallet_app

* fix: build examples/wallet_app with java 21

.env.ci

@@ -1,3 +1,4 @@
 FLUTTER_VERSION=3.27.1
+JAVA_VERSION=21
 STARKNET_RPC=http://localhost:5050
 DEVNET_DUMP_PATH=/devnet-dump.json

.github/actions/android-setup/action.yaml

@@ -0,0 +1,18 @@
+name: 'Setup environment to build Android application'
+description: 'Configures Java and Android SDK for building Android applications'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Dotenv Action
+      id: load-env
+      uses: falti/[email protected]
+      with:
+        path: .env.ci
+    - name: Java setup
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'zulu'
+        java-version: ${{ steps.load-env.outputs.java_version }}
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3

.github/workflows/build-android-examples.yaml

@@ -0,0 +1,18 @@
+name: Build android examples
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build-wallet-app-example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Flutter setup
+        uses: ./.github/actions/flutter-setup
+      - name: Java/Android setup
+        uses: ./.github/actions/android-setup
+      - uses: bluefireteam/melos-action@v3
+      - name: Build wallet_app example
+        run: flutter build appbundle
+        working-directory: ./examples/wallet_app

examples/wallet_app/android/settings.gradle

@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.1.0" apply false
+    id "com.android.application" version "8.2.1" apply false
     id "org.jetbrains.kotlin.android" version "1.9.10" apply false
 }