add CI

Author: joeltg

.github/workflows/ci.yaml

@@ -0,0 +1,13 @@
+name: CI
+on: [push, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    name: Build and Test
+    steps:
+      - uses: actions/checkout@v3
+      - uses: mlugg/setup-zig@v2
+        with:
+          version: 0.15.1
+      - run: zig build test