Added GitHub workflow as CI

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master, dev ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+
+    - name: Install Bazel
+      run: |
+        wget https://github.com/bazelbuild/bazel/releases/download/3.4.1/bazel_3.4.1-linux-x86_64.deb
+        wget https://github.com/bazelbuild/bazel/releases/download/3.4.1/bazel_3.4.1-linux-x86_64.deb.sha256
+        sha256sum -c bazel_3.4.1-linux-x86_64.deb.sha256
+        sudo dpkg -i bazel_3.4.1-linux-x86_64.deb
+        
+    - name: Build
+      run:
+        bazel build :doubak
+
+    - name: Test
+      run:
+        bazel test //...

README.md

@@ -1,4 +1,7 @@
 # Doubak
+
+[![GitHub Action CI](https://github.com/its-my-data/doubak/workflows/CI/badge.svg?branch=master)](https://github.com/its-my-data/doubak/actions?query=workflow%3ACI)
+
 豆瓣 (Douban.com) 备份工具命令行版，备份完整页面镜像，Golang实现。
 
 ## 为什么会有此项目？