Red Hat Satellite Capsule upgrade fails on finding capsule-certs.tar file

Issue

• Upgrading or running the installer on a Red Hat Satellite Capsule fails with the following traceback:

[root@capsule ~]# satellite-installer    # optionally followed by any arguments, i.e. --scenario capsule --upgrade -v
..
[ INFO 2020-06-10T13:16:30 verbose] Executing hooks in group pre_validations
The certs tar file generated by the server is not present at /root/certs.tar, exiting.
[ERROR 2020-06-10T13:16:30 verbose] The certs tar file generated by the server is not present at /root/certs.tar, exiting.
[ INFO 2020-06-10T13:16:30 verbose] Installer finished in 1.930692308 seconds