Remove unnecessary workspace reference

Author: staszczuk

.github/workflows/base_build.yml

@@ -71,7 +71,7 @@ jobs:
         uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4.4.3
         with:
           name: mtl-release-bin
-          path: '${{ github.workspace }}/build/'
+          path: 'build/'
 
   ubuntu-ebpf-xdp-build:
     needs: changes