Minimal changes to support windows

Author: dalito

.github/workflows/main.yaml

@@ -5,18 +5,21 @@
 name: Build and test linkml-model
 
 on:
-  pull_request:
+  push:
     branches: [ main ]
-    types: [ opened, synchronize, reopened ]
+  pull_request:
+  workflow_dispatch:
 
 jobs:
   test:
-
-    runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         python-version: ["3.9", "3.10"]
 
+    runs-on: ${{ matrix.os }}
+
     steps:
 
       #----------------------------------------------