Fix Apk name

Author: kez-lab

.github/workflows/sample.yml

@@ -56,5 +56,5 @@ jobs:
           appId: ${{ secrets.FIREBASE_APP_ID }}
           serviceCredentialsFileContent: ${{ secrets.CREDENTIAL_FILE_CONTENT }}
           groups: sample-tester
-          file: app/build/outputs/apk/release/app-release.apk
+          file: app/build/outputs/apk/release/app-release-unsigned.apk
         # 릴리즈 APK를 Firebase 테스터 그룹에 배포합니다.