ci: add Windows build

Author: hugo-syn

.github/workflows/release.yml

@@ -41,11 +41,14 @@ jobs:
         run: |
           go mod tidy
           go build
+          GOOS=windows go build
       - name: "Upload binary"
         uses: actions/upload-artifact@v4
         with:
           name: octoscan
-          path: ./octoscan
+          path: |
+            ./octoscan
+            ./octoscan.exe
 
   validate-tag:
     name: Validate tag