check: use blobless partial clones

The check operation doesn't need any blobs. The most detail is ever
needs about commits is the paths they touched, which only requires
commit and tree objects, not the blobs.

On large repositories, especially with lots of history, this can
dramatically reduce the time to clone and fetch while also dramatically
reducing the server-side resources used to serve up those large git
repositories.

Signed-off-by: Ryann Graham <r.m.graham@gmail.com>

Author: rmg

assets/check

@@ -56,7 +56,7 @@ else
     branchflag="--branch $branch"
   fi
 
-  git clone --bare --single-branch $uri $branchflag $destination $tagflag
+  git clone --bare --filter=blob:none --single-branch $uri $branchflag $destination $tagflag
   cd $destination
   # bare clones don't configure the refspec
   if [ -n "$branch" ]; then