add GitHub Actions for CI

.github/workflows/go.yml

@@ -0,0 +1,24 @@
+name: Go
+on: [push]
+jobs:
+
+  test:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: [ '1.14.x' ]
+    steps:
+
+    - name: Set up Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.go }}
+      id: go
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+
+    - name: test
+      run: |
+        make check