Copy surefire xml files to CircleCI junit folder

cf. https://circleci.com/docs/test-metadata/#maven-surefire-plugin-for-java-junit-results

circle.yml

@@ -11,6 +11,8 @@ test:
     - cp ./target/AuthMe-*-SNAPSHOT-spigot.jar $CIRCLE_ARTIFACTS
     - cp ./target/AuthMe-*-SNAPSHOT-legacy.jar $CIRCLE_ARTIFACTS
     - cp ./target/AuthMe-*-SNAPSHOT-spigot.jar $CIRCLE_ARTIFACTS/AuthMe.jar
+    - mkdir -p $CIRCLE_TEST_REPORTS/junit/
+    - find . -type f -regex ".*/target/surefire-reports/.*xml" -exec cp {} $CIRCLE_TEST_REPORTS/junit/ \;
 notify:
   webhooks:
     - url: https://webhooks.gitter.im/e/7b92ac1a1741748b26bf