add ci

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main 
+  pull_request:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: goto-bus-stop/setup-zig@v1
+        with:
+          version: i0.11.0
+
+      - name: Fmt
+        run: zig fmt . --check
+        if: matrix.os == 'ubuntu-latest'
+
+      - name: Build
+        run: zig build
+
+      - name: Build release
+        run: zig build -Doptimize=ReleaseSafe