gh: Make prerelease workflow upload an artifact.

Author: Jezurko

.github/workflows/prerelease.yml

@@ -67,6 +67,13 @@ jobs:
             ./LICENSE
             ./builds/ninja-multi-default/package/*
 
+      - name: Upload VAST artiface
+        uses: actions/upload-artifact@v4
+        with:
+          files: |
+            ./LICENSE
+            ./builds/ninja-multi-default/package/*
+
       - name: Build VAST Doc
         run: cmake --build --preset ninja-rel --target vast-doc