travis: deploy only on success, don't install shared keystore

.travis.yml

@@ -4,10 +4,7 @@ android:
   components:
     - android-29
     - build-tools-28.0.3
-before_script:
-  - mkdir -p $ANDROID_HOME/.android/
-  - cp debug.keystore $ANDROID_HOME/.android/
-after_script:
+after_success:
   - $ANDROID_HOME/build-tools/28.0.3/apksigner sign --ks debug.keystore --ks-key-alias androiddebugkey --ks-pass "pass:android" --key-pass "pass:android" --in $(find -name "*-blue-release-unsigned.apk") --out husky-release.apk
   - wget https://raw.githubusercontent.com/FWGS/uploadtool/master/upload.sh
   - chmod +x upload.sh