Docs: document the required dependencies in the slurm side

[poautran]

In GitLab by @woutdenolf on Aug 18, 2025, 15:53 GMT+2:

https://gitlab.esrf.fr/apptainer/txs/-/merge_requests/4#note_458979

Migrated from GitLab: https://gitlab.esrf.fr/workflow/ewoks/ewoksjob/-/issues/72