fix: upload glob to match lib-prefixed artifacts on Linux/macOS

Linux/macOS artifacts are prefixed with 'lib' (e.g., libsigner_nif-*).
Use *signer_nif-*.tar.gz to match all platforms.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: skedzior

.github/workflows/nif_build.yml

@@ -52,4 +52,4 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           files: |
-            signer_nif-*
+            *signer_nif-*.tar.gz