Update CI

* Update drone to v1.x
* Add GitHub Actions

cases/ci/drone/demo/.drone.yml

@@ -0,0 +1,19 @@
+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

cases/ci/drone/demo/README.md

@@ -0,0 +1 @@
+# Drone Demo

cases/ci/drone/demo/app.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main(){
+    fmt.Printf("Hello World!\n");
+}