Update CI

* Update drone to v1.x
* Add GitHub Actions

cases/ci/actions/README.md

@@ -0,0 +1,28 @@
+# GitHub Actions
+
+GitGub Actions 是 GitHub 推出的一款 CI/CD 工具。
+
+我们可以在每个 job 的 step 中使用 Docker 执行构建步骤。
+
+```yaml
+on: push
+
+name: CI
+
+jobs:
+  my-job:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+        with:
+          fetch-depth: 2
+      - name: run docker container
+        uses: docker://golang:alpine
+        with:
+          args: go version
+```
+
+## 参考资料
+
+* [Actions Docs](https://help.github.com/en/categories/automating-your-workflow-with-github-actions)