Add a GitHub Actions build task (#4)

Add a GitHub Actions build task

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Go
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [ '1.21.x' ]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Build
+        run: |
+          go build