ci: clean Gradle before build

Author: mhaeming

.github/workflows/main.yml

@@ -19,6 +19,8 @@ jobs:
           java-version: '11'
           distribution: 'temurin'
           cache: gradle
+      - name: Clean Gradle
+        run: ./gradlew clean
       - name: Build debug APK
         run: ./gradlew assembleDebug
       - name: Upload APK