update drone

.drone.yml

@@ -22,6 +22,8 @@ steps:
           - apt-get update -yqq
           - apt-get install -yqq zip tar
           - cd .. && tar -cvzf stepper-${DRONE_COMMIT}.tar.gz ./nami && mv stepper-${DRONE_COMMIT}.tar.gz nami/ && cd nami
+      when:
+          event: tag
 
     - name: gitea_release
       image: plugins/gitea-release
@@ -30,8 +32,5 @@ steps:
               from_secret: gitea_api_key
           base_url: https://git.susy-system.de
           files: ./stepper-${DRONE_COMMIT}.tar.gz
-trigger:
-    branch:
-        - master
-    event:
-        - push
+      when:
+          event: tag