I mentioned in a previous post that this was coming... well it's here now! :)
We have local mirrors of yum.oracle.com inside the OCI regions:
Unlike our Oracle Container Registry mirrors, these yum repos are only available from inside the OCI regions. So if you have instances in a given region, you can point your yum.repo to your local server and you get (1) very fast yum installs and (2) no counting against your network bandwidth since it doesn't leave the datacenters. Oracle Linux 6 and 7 are mirrored, we are also adding Oracle Linux 5.