don't deploy PRs

[CI SKIP]

.drone.yml

@@ -1,11 +1,26 @@
 kind: pipeline
 type: exec
+name: test
+clone:
+  skip_verify: true
+trigger:
+  event:
+    - pull_request
+steps:
+- name: test
+  commands:
+  - git submodule update --init --recursive
+  - hugo -d $(mktemp -d)
+---
+kind: pipeline
+type: exec
 name: build & deploy
 clone:
   skip_verify: true
-platform:
-  os: linux
-  arch: amd64
+trigger:
+  event:
+    exclude:
+      - pull_request
 steps:
 - name: build
   commands: