Add s-nail package

[priteau]

This includes the /usr/bin/mail command, which is required for Slurm to send email notifications [1].

[1] https://slurm.schedmd.com/slurm.conf.html#OPT_MailProg

[sjpb]

Is the package alone enough to be useful? I was expecting this was e.g. to send emails on job status and therefore to see e.g. Mail* parameters configured in slurm.conf configured?

[priteau]

Is the package alone enough to be useful? I was expecting this was e.g. to send emails on job status and therefore to see e.g. Mail* parameters configured in slurm.conf configured?

There is actually no other configuration to perform in Slurm itself. Of course, you need a functional Postfix SMTP relay, but its configuration is mostly site-specific. I was planning to push some documentation separately, as I still want to check if we should import an existing Ansible role for Postfix configuration.

[priteau]

To be more precise, this is because the default value of MailProg is already /bin/mail (or /usr/bin/mail if /bin/mail does not exist but /usr/bin/mail does exist), as documented in https://slurm.schedmd.com/slurm.conf.html.

[priteau]

Image build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/16146871938

[sjpb]

OK - as it is just a package it doens't need docs for slurm-controlled-rebuild or isolated slurm.