introduce CI (#4)

Author: cp-20

.github/workflows/ci.yaml

@@ -0,0 +1,13 @@
+name: CI
+
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+      - name: Run tests
+        run: go test ./... -v