Add GitHub workflow to run tests

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: "Run Tests"
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.20'
+      - name: Run tests
+        run: go test