fix pipeline by disabling PRs entirely

.drone.yml

@@ -29,12 +29,11 @@ steps:
       - staging
       - staging-${DRONE_BUILD_NUMBER}
   when:
-      branch:
-        exclude:
-          - master
-      event:
-        exclude:
-          - push
+    branch:
+      exclude:
+        - master
+    event:
+      - push
 - name: bump tag in deployment-repo (prod)
   image: aaronriedel/kustomize-ci
   commands:
@@ -67,8 +66,7 @@ steps:
       exclude:
         - master
     event:
-      exclude:
-        - push
+      - push
 - name: push new tag to deployment-repo (prod)
   image: appleboy/drone-git-push
   settings:
@@ -107,8 +105,11 @@ steps:
       exclude:
         - master
     event:
-      exclude:
-        - push
+      - push
 volumes:
 - name: deployment-repo
   temp: {}
+when:
+  event:
+    exclude:
+      - pull_request