remove gradle again

frontend/.github/workflows/build_app_android.yaml

@@ -42,8 +42,9 @@ jobs:
       - 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