test win artifact generation on pushing to release

this will get a chance to check that win artifact generation works correctly
before creating the release tag.

.github/workflows/windows-artifacts.yml

@@ -2,7 +2,7 @@ name: windows-artifacts
 
 on:
   push:
-    branches: [ test_artifacts, win_artifacts ]
+    branches: [ test_artifacts, win_artifacts, release ]
   release:
     types:
       - published
@@ -53,5 +53,6 @@ jobs:
       uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # tag=v4.3.1
       with:
         compression-level: 9  # maximum compression
+        if-no-files-found: error # defaults to `warn`
         path: ${{ github.workspace }}/zstd-${{ github.ref_name }}-${{matrix.ziparch}}/
         name: zstd-${{ github.ref_name }}-${{matrix.ziparch}}