Setup CI with GitHub Actions

.github/workflows/lint.yaml

@@ -0,0 +1,22 @@
+name: lint
+permissions:
+  contents: read
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+    - uses: actions/checkout@v2
+    - name: golangci-lint
+      uses: golangci/golangci-lint-action@v2
+      with:
+        version: v1.43.0

.github/workflows/test.yaml

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+name: test
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 5
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macOS-latest]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-go@v2
+      with:
+        go-version: 1.17.6
+    - uses: actions/cache@v2
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: test
+      run: make test