Merge pull request #3180 from nextcloud/ci/sign-drone-master

chore(CI): Sign .drone.yml file

.drone.yml

@@ -1,3 +1,4 @@
+---
 kind: pipeline
 type: docker
 name: generic
@@ -75,3 +76,6 @@ trigger:
   event:
     - push
     - pull_request
+---
+kind: signature
+hmac: ec6ade108f26cc1bcea307175de8389beb3e0d04be737e27b25e7de3effc2c32