ci: point dl artifact action to dir

.github/workflows/release.yml

@@ -25,10 +25,10 @@ jobs:
         uses: actions/download-artifact@v4.1.8
         with:
           name: poster
-          path: modos.pdf
+          path: build/
 
       - name: create release
         uses: softprops/action-gh-release@v2
         with:
-          files: modos.pdf
+          files: build/modos.pdf