ci: retry gradlew up to 3x to survive transient CDN/network errors

.gitea/workflows/android-build.yml

@@ -94,11 +94,21 @@ jobs:
 
       - name: Build Debug APK
         working-directory: android
-        run: ./gradlew assembleDebug --no-daemon
+        run: |
+          # Retry up to 3 times to survive transient network errors when the
+          # Gradle wrapper downloads its distribution from GitHub CDN.
+          for attempt in 1 2 3; do
+            ./gradlew assembleDebug --no-daemon && break
+            [ "$attempt" -lt 3 ] && echo "Attempt $attempt failed — retrying in 30s..." && sleep 30 || exit 1
+          done
 
       - name: Build Release APK (unsigned — no signing key required)
         working-directory: android
-        run: ./gradlew assembleRelease --no-daemon
+        run: |
+          for attempt in 1 2 3; do
+            ./gradlew assembleRelease --no-daemon && break
+            [ "$attempt" -lt 3 ] && echo "Attempt $attempt failed — retrying in 30s..." && sleep 30 || exit 1
+          done
 
       # ── 9. Upload APKs as workflow artifacts ─────────────────────────────────
       - name: Upload APKs as artifacts