feat: add GH workflow and example test

.github/workflows/main.yaml

@@ -0,0 +1,22 @@
+name: main
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: '1.20'
+    - name: Run build
+      run: go build -v ./...
+
+    - name: Run tests
+      run: go test -v ./...