Add GitHub Actions workflow for Windows build

.github/workflows/build-windows.yml

@@ -0,0 +1,28 @@
+name: Build for Windows
+
+on:
+  workflow_dispatch:
+
+jobs:
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3.5.0
+        with:
+          node-version: 18
+
+      - name: Install Modules and Build
+        run: |
+          npm install
+          npm run dist:win
+
+      - name: Upload Windows Build
+        uses: actions/upload-artifact@v3
+        with:
+          name: windows-build
+          path: |
+            dist/*.blockmap
+            dist/*.zip
+            dist/*.exe