fix pipeline by disabling PRs entirely

.drone.yml

@@ -33,7 +33,6 @@ steps:
       exclude:
         - master
     event:
-        exclude:
       - push
 - name: bump tag in deployment-repo (prod)
   image: aaronriedel/kustomize-ci
@@ -67,7 +66,6 @@ steps:
       exclude:
         - master
     event:
-      exclude:
       - push
 - name: push new tag to deployment-repo (prod)
   image: appleboy/drone-git-push
@@ -107,8 +105,11 @@ steps:
       exclude:
         - master
     event:
-      exclude:
       - push
 volumes:
 - name: deployment-repo
   temp: {}
+when:
+  event:
+    exclude:
+      - pull_request