Demo rhel9

[pwalczysko]

Replaced by #379

Adding only the demo-server playbook. The tests are minimal, basically just syntax. Could not make the full test work.

@jburel I had the demo-server playbook already in prep, I just forgot about it when we discussed.
Happy to add the training-server playbook too.

[pwalczysko]

I am not getting forward here, because of

Molecule ome-demoserver > syntax
  Warning: : Invalid characters were found in group names but not replaced, use
  -vvvv to see details
  ERROR! the role 'ome.postgresql' was not found in /home/runner/work/prod-playbooks/prod-playbooks/roles:/home/runner/.cache/molecule/prod-playbooks/ome-demoserver/roles:/home/runner/work/prod-playbooks:/home/runner/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles:/home/runner/work/prod-playbooks/prod-playbooks
  The error appears to be in '/home/runner/work/prod-playbooks/prod-playbooks/ome-demoserver.yml': line 101, column 7, but may
  be elsewhere in the file depending on the exact syntax problem.
  The offending line appears to be:
      - role: ome.postgresql

This error ^^^ can be solved if I commit the whole roles folder to this PR. I genuinely do not understand where the roles are installed in the GHA and why the subsequent syntax does not find them.

any ideas please @sbesson @khaledk2 ?

[pwalczysko]

Replaced by #379 - sorry for the noise.