diff --git a/.github/workflows/build-f-droid-apk.yml b/.github/workflows/build-f-droid-apk.yml
index 8f8dc26..132ddce 100644
--- a/.github/workflows/build-f-droid-apk.yml
+++ b/.github/workflows/build-f-droid-apk.yml
@@ -95,6 +95,7 @@ jobs:
           cd android
           ./gradlew clean
           ./gradlew bundleRelease --no-daemon --warning-mode all
+          ./jarsigner -verify -verbose android/app/build/outputs/bundle/release/app-release.aab
 
       - name: Create Release
         uses: softprops/action-gh-release@v1
@@ -134,6 +135,7 @@ jobs:
           cd android
           ./gradlew clean
           ./gradlew assembleRelease --no-daemon --warning-mode all
+          ./jarsigner -verify -verbose android/app/build/outputs/apk/release/app-release-signed.apk
 
       ## sign generated apk
       - name: Sign APK
diff --git a/.gitignore b/.gitignore
index 1e103ea..1886aa9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,4 +41,7 @@ scripts/fetchHTML/
 # generated plugin from `npm run build:plugin`
 # Not ignoring this, to prevent [stderr] None of these files exist:  * syncadaptor-ui.html
 # assets/plugins/
-@tiddly-gittly__tidgi-mobile.jks.base64.txt
+@tiddly-gittly__tidgi-mobile.jks.base64.txt
+
+# prebuild
+android/
\ No newline at end of file