Add GitHub Actions workflow for Go tests

Create .github/workflows/test.yml to run Go tests on push and pull_request. The job checks out the repo, sets up Go using actions/setup-go@v5 (version taken from go.mod with caching), and runs `go test ./...` on ubuntu-latest to provide CI test coverage.

Author: JR-1991

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Go Tests
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Run tests
+        run: go test ./...