ci: add a simple CICD workflow

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: build code
+
+on:
+    push:
+        branches:
+            - main
+    workflow_dispatch:
+
+jobs:
+    build:
+        runs-on: macos-14
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Show system info
+              run: |
+                  uname -a