Added flutter step

.github/workflows/android_clean_build_tests.yml

@@ -4,16 +4,10 @@ on:
   push:
     branches:
       - "feature/CiBuildTest"
-  workflow_call:
-    inputs:
-      android-version:
-        required: false
-        default: 29
-        type: number
 
 jobs:
   android_clean_build_test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         api-level: [ 34 ]
@@ -33,6 +27,12 @@ jobs:
           distribution: 'zulu'
           java-version: 17
 
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "3.22.2"
+          channel: 'stable'
+          cache: true
+
       - name: Gradle cache
         uses: gradle/actions/setup-gradle@v3
         with:
@@ -72,5 +72,10 @@ jobs:
           emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
           disable-animations: true
           script: |
-            echo "Hello World"
+            mkdir "test_run"; cd "$_"
+            flutter create --template=app --platforms=android,ios demo_project
+            cd demo_project
+            sed -i'' -e 's/"org.jetbrains.kotlin.android" version "1.7.10"/"org.jetbrains.kotlin.android" version "1.8.10"/g' android/settings.gradle
+            flutter pub add adyen_checkout
+            flutter pub get