chore(CI): Sign .drone.yml file

Signed-off-by: Joas Schilling <coding@schilljs.com>

.drone.yml

@@ -1,3 +1,4 @@
+---
 kind: pipeline
 name: qt-5.15
 
@@ -193,3 +194,6 @@ trigger:
   event:
     - pull_request
     - push
+---
+kind: signature
+hmac: de1a119efa45cbf852b2f13da0f1b598686bdc1609f3cf95cc704f2ea51254ee