remove gradle again

frontend/.github/workflows/build_app_android.yaml

@@ -1,7 +1,7 @@
 on:
   push:
-    tags:
-      - 'v*'
+    branches:
+      - main
 
 jobs:
   build:
@@ -23,13 +23,6 @@ jobs:
 
       - name: Setup android SDK
         uses: android-actions/setup-android@v3
-      
-      - name: Install Flutter
-        uses: subosito/flutter-action@v2
-        with:
-          channel: stable
-          flutter-version: 3.22.0
-          cache: true
 
       - name: Infer version number from git tag
         id: version
@@ -37,14 +30,13 @@ jobs:
           REF_NAME: ${{ github.ref_name }}
         run:
           # remove the 'v' prefix from the tag name
-          echo "VERSION_NAME=${REF_NAME//v}" >> $GITHUB_ENV
+          echo "VERSION=${REF_NAME//v}" >> $GITHUB_OUTPUT
 
       - name: Load secrets from github
         run: |
           echo "${{ secrets.ANDROID_SECRET_PROPERTIES }}" > secrets.properties
+          echo "${{ secrets.ANDROID_KEYSTORE }}" > release.keystore
           echo "${{ secrets.ANDROID_GOOGLE_PLAY_JSON }}" > google-key.json
-          # decode the base64 encoded google key
-          base64 -d ${{ secrets.ANDROID_KEYSTORE_BASE64 }} > release.keystore
         working-directory: android
 
       - name: Install fastlane
@@ -54,4 +46,5 @@ jobs:
       - name: Run fastlane lane
         run: bundle exec fastlane deploy_testing
         working-directory: android
-        # the environment variable VERSION_NAME is implicitly available
+        env:
+          VERSION_NAME: ${{ steps.version.VERSION }}

frontend/android/fastlane/Fastfile

@@ -7,14 +7,10 @@ platform :android do
 
   desc "Deploy a new version as a preview version"
   lane :deploy_testing do
-    version_name = ENV["VERSION_NAME"]
-
     sh(
-      "flutter",
-      "build",
-      "appbundle",
-      "--release",
-      "--build-name=#{version_name}",
+      "flutter build appbundle --release",
+      "--build-name=",
+      ENV["VERSION_NAME"],
       )
     
     upload_to_play_store(