M #-: Add Slurm Controller and Slurm Worker appliances

[dgarcia18]

This PR:

• Adds Slurm Controller and Slurm Worker appliances logic and packer script
• Modifies Makefile to add new Slurm appliances

Both appliances are based on Ubuntu 24.04.

Appliance logic description:

• Controller
  • Install
    • Installs the following packages: munge libmunge-dev slurmctld
    • Injects the /etc/slurm/slurm.conf config file. This file is prepared for configless Slurm usage and includes a nodeset called "one" and a partition that groups all nodes.
    • Creates repositories to save the Slurm state and enables the slurmctld service
  • Configure
    • Sets the hostname to slurm-one-controller
    • Adds the hostname to /etc/hosts so that it can be resolved to the main IP address
    • If needed (based on the /etc/munge/one_key_generated flag file) generates a new Munge key and exposes it through OneGate under the MUNGE_KEY_BASE64 attribute
    • Restarts slurmctld if needed and checks it started correctly
• Worker
  • Install
    • Installs the following packages: munge libmunge-dev slurmd
  • Configure
    • Checks that the context vars ONEAPP_SLURM_CONTROLLER_IP and ONEAPP_MUNGE_KEY_BASE64 are received and not empty
    • Checks that the controller can be reached via port 6817 (slurmctld port). If not, retries several times
    • Obtains the VM ID via onegate (with retry logic)
    • Configures the VM hostname to slurm-one-worker-#{vm_id}
    • Adds the controller to /etc/hosts so that the controller hostname is resolvable
    • Adds the new munge key (received via ONEAPP_MUNGE_KEY_BASE64) to /etc/munge/munge.key and starts the Munge service
    • Checks Munge is fully operational
    • Adds the new worker node using the "-Z" option: https://slurm.schedmd.com/dynamic_nodes.html
      • I.e. slurmd -Z --conf "CPUs=#{cpus} RealMemory=#{mem_mb} Feature=one" --conf-server #{controller_ip}