Update spack.yaml

spack.yaml

@@ -90,7 +90,7 @@ spack:
         - pushd spack && git checkout ${SPACK_CHECKOUT_VERSION} && popd
         - . "./spack/share/spack/setup-env.sh"
       after_script:
-        - tar czvf binary_artifacts.tar.gz jobs_scratch_dir/mirror/build_cache/*
+        - tar czvf binary_artifacts.tar.gz ${CI_PROJECT_DIR}/jobs_scratch_dir/mirror/build_cache/*
       artifacts:
        paths:
          - binary_artifacts.tar.gz