resources: add packer to gitignore

Change-Id: I0cd035e9e32e7dda38319d49b1a03cbbf8370c2b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/32335
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
1 file changed
tree: f114e8cc132a09ff5f31b76c62acf6006402becb
  1. .gitignore
  2. README.md
  3. src/