Unable to find a match: postgresql*-server

I have a fresh Rocky Linux 8 VM ([vggp-v60-j326-d1dfcf46c4cd-main](https://github.com/usegalaxy-eu/vgcn)) however installing postgresql15-server fails at the install step:
https://github.com/galaxyproject/ansible-postgresql/blob/f23cb7a2fca78cad977c5db09e489a983bc6411f/tasks/redhat.yml#L50

with:
```
All matches were filtered out by modular filtering for argument: postgresql15-server
Error: Unable to find a match: postgresql15-server
```
Should this case be covered by the role?

Additionally, manually installing with AppStream disabled, resulted in the same error (`sudo yum --disablerepo AppStream install postgresql15-server`) and the only way I've found to resolve the issue was to disable the postgresql stream module in AppStream: `sudo yum module disable postgresql`

Start by reproducing the PostgreSQL 15 installation on a fresh Rocky Linux 8 VM, then inspect the package-install task in tasks/redhat.yml around line 50. Compare the role's behavior with disabling the PostgreSQL AppStream module. Done means the role can install postgresql15-server successfully on this environment or clearly documents the unsupported case.

Written by the indexing model from the issue text.