Split chapter 20

21_case_devops/drone_demo.drone.yml

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+kind: pipeline
+type: docker
+name: build
+steps:
+- name: build
+  image: golang:alpine
+  pull: if-not-exists # always never
+  environment:
+    KEY: VALUE
+  commands:
+    - echo $KEY
+    - pwd
+    - ls
+    - CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+    - ./app
+
+trigger:
+  branch:
+  - master