ci: implement test workflow

.github/workflows/check.yml

@@ -0,0 +1,23 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    name: Build + Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: 1.21
+      - name: Build
+        run: make build
+      - name: Test
+        run: make test