[spec] add windows build test

Author: i4004

.github/workflows/build.yml

@@ -8,7 +8,11 @@ defaults:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
 
     steps:
       - name: Code Checkout