Do not use the alternative Archive URL on PPM #623
Description
Because sometimes PPM serves a source package there, while serving a binary at the proper URL:
! error in pak subprocess
Caused by error in `verify_extracted_package(filename, pkg_cache)`:
!
'/tmp/RtmpraRRfO/file10aed93d50/src/contrib/x86_64-pc-linux-gnu-ubuntu-22.04/4.4/later_1.3.2.tar.gz'
is not a valid binary, it is missing later/Meta/package.rds.
pak only uses the alternative URL for a repo named 'CRAN', so a workaround is to name your repo something else, e.g. 'PPM' seems appropriate.