fix: use push-o-matic to create release (#15562)

.github/workflows/prepare-release.yml

@@ -68,10 +68,17 @@ jobs:
     needs: build_mobile
 
     steps:
+      - name: Generate a token
+        id: generate-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.PUSH_O_MATIC_APP_ID }}
+          private-key: ${{ secrets.PUSH_O_MATIC_APP_KEY }}
+      
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          token: ${{ secrets.ORG_RELEASE_TOKEN }}
+          token: ${{ steps.generate-token.outputs.token }}
 
       - name: Download APK
         uses: actions/download-artifact@v4