Update Dockerfile

[bkaraoren]

I have observed the issue when using a self hosted github runner. I use self hosted runner as RHEL9 and by default the actions are running on a container on this self hosted runner.

Currently there is no "redhat/ubi9" shortname exist on RHEL system configurations.

The files are;
000-shortnames.conf
001-rhel-shortnames.conf
002-rhel-shortnames-overrides.conf

so it can not find any relation with that name and asking interaction with the error below;

STEP 1/11: FROM redhat/ubi9
  Error: creating build container: short-name resolution enforced but cannot prompt without a TTY
  Warning: Docker build failed with exit code 12[5](https://github.com/showroom-project/showroom-inventory/actions/runs/9993222819/job/27620117768#step:2:5), back off 8.961 seconds before retry.

[bkaraoren]

@IPvSean would you consider this PR? thanks

[IPvSean]

LGTM, I can test some more, need to fix my CI process here, ignore the "fail"