Add Github Actions CI script

.github/workflows/ci.yml

@@ -0,0 +1,48 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.12
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Build
+        run: |
+          make build
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.12
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Test
+        run: |
+          make test
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.12
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Lint
+        run: |
+          make lint