Modify `.drone.yml`.

.drone.yml

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