ci: add GitHub Actions workflow to run Go tests

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: Go CI
+
+on:
+  push:
+    branches:
+      - "**" # runs on push to any branch
+  pull_request:
+    branches:
+      - "**" # runs on all PRs
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        go-version: [1.25]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Cache Go modules
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Install dependencies
+        run: go mod download
+
+      - name: Run tests
+        run: go test ./... -v