Add GitHub Actions script.

.github/workflows/go.yml

@@ -0,0 +1,21 @@
+name: Go Build
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Setup Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: 1.21.1
+
+    - name: Build
+      run: make