Create initial GitHub actions workflow

.github/workflows/test.yml

@@ -0,0 +1,33 @@
+name: test
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        go-version: [1.17.x]
+        include:
+          - go-version: 1.16.x
+            os: ubuntu-latest
+
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Test
+      run: tools/build
+      env:
+        VERBOSE: 1
+        TESTING: 1