update drone.yml

drone.yml

 #    - mkdir -p dist/etc/nginx/snippets
 #    - cp -p config/nginx-datasrc-location.conf dist/etc/nginx/snippets/nginx-datasrc-location.conf
     - RELEASE=${DRONE_REPO_NAME}-${DRONE_REPO_BRANCH}
-#    - \[ -n "${DRONE_TAG}" \] && RELEASE=$RELEASE-${DRONE_TAG}
+    - test -n "${DRONE_TAG}" && RELEASE=$RELEASE-${DRONE_TAG}
     - echo $RELEASE
 #    - mv dist $RELEASE
 #    - ls -la $RELEASE ; find $RELEASE -type f -exec md5sum '{}' \;