add mac/windows tests

Author: pelikhan

.github/workflows/npm-check.yml

@@ -4,10 +4,24 @@ on:
     schedule:
         - cron: "0 4 * * *"
 jobs:
-    build:
+    ubuntu:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/setup-node@v4
               with:
                   node-version: "20"
             - run: npx --yes genaiscript --help
+    windows:
+        runs-on: windows-latest
+        steps:
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: "20"
+            - run: npx --yes genaiscript --help
+    macos:
+        runs-on: macos-latest
+        steps:
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: "20"
+            - run: npx --yes genaiscript --help