Modify `.drone.yml`.

.drone.yml

@@ -1,13 +1,29 @@
-plan:
+kind: pipeline
+type: docker
+name: plan
+
+steps:
+  - name: plan
     image: reg.kazu634.com/kazu634/terraform
     commands:
       - terraform plan
-  when:
-    branch: "!master"
 
-apply:
+trigger:
+  branch:
+    exclude:
+    - master
+
+---
+kind: pipeline
+type: docker
+name: plan
+
+steps:
+  - name: apply
     image: reg.kazu634.com/kazu634/terraform
     commands:
       - terraform apply
-  when:
-    branch: master
+
+trigger:
+  branch:
+  - master