Description of problem:
Although it worked initially when I tried first some months ago,
rhel toolbox feature is no longer working for me in Fedora.

Version-Release number of selected component (if applicable):
toolbox-0.0.99.1-1.fc33.x86_64

Steps to Reproduce:
$ toolbox create --distro rhel --release 8.3
Image required to create toolbox container.
Download registry.access.redhat.com/ubi8/ubi:8.3 (500MB)? [y/N]: y
Created container: rhel-toolbox-8.3
Enter with: toolbox enter rhel-toolbox-8.3

Actual results:
$ toolbox enter rhel-toolbox-8.3
Error: invalid entry point PID of container rhel-toolbox-8.3

Expected results:
rhel-toolbox-8.3 to start

Additional info:
$ podman image list ubi8
REPOSITORY                           TAG     IMAGE ID      CREATED      SIZE
registry.access.redhat.com/ubi8/ubi  8.3     4199acc83c6a  6 weeks ago  213 MB