[ci] Remove package installation from artifact download job

The artifact download job currently installs a package and needs
sudo/root permissions for that, which are not available in all builders.
Remove the sudo call, as it was for debugging only.

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/ci/download-artifacts-template.yml b/ci/download-artifacts-template.yml
index 8dca21f..ff294ea 100644
--- a/ci/download-artifacts-template.yml
+++ b/ci/download-artifacts-template.yml
@@ -23,9 +23,6 @@
       . util/build_consts.sh
       mkdir -p "$BIN_DIR"
 
-      sudo apt-get install -y tree
-
-      tree "$BUILD_ROOT"
       find "$BUILD_ROOT/downloads" \
         -name 'build-bin.tar' \
         -exec \
@@ -33,6 +30,4 @@
           --strip-components=1 \
           --overwrite \
           -xvf {} \;
-      tree "$BUILD_ROOT"
     displayName: 'Unpack upstream outputs'
-