update

.github/workflows/build.yml

@@ -39,6 +39,7 @@ jobs:
           retention-days: 1
 
       - id: Sign
+        if: ${{ runner.os == 'Windows' }}
         uses: signpath/github-action-submit-signing-request@v1.1
         with:
           api-token: '${{ secrets.SIGNPATH_API_TOKEN }}'