Add login node in the spack openfoam tutorial example

[harshthakkar01]

This PR adds login node in spack-openfoam tutorial example.
Manual Test on login node sbatch /opt/apps/openfoam/submit_openfoam.sh

[ext_harshthakkar_google_com@spackopenf-login-login-001 test_run]$ ls
0         hostfile     processor12  processor17  processor21  processor26  processor30  processor35  processor4   processor44  processor49  processor53  processor58  processor9
0.orig    processor0   processor13  processor18  processor22  processor27  processor31  processor36  processor40  processor45  processor5   processor54  processor59  slurm-1.out
Allclean  processor1   processor14  processor19  processor23  processor28  processor32  processor37  processor41  processor46  processor50  processor55  processor6   system
Allrun    processor10  processor15  processor2   processor24  processor29  processor33  processor38  processor42  processor47  processor51  processor56  processor7
constant  processor11  processor16  processor20  processor25  processor3   processor34  processor39  processor43  processor48  processor52  processor57  processor8
[ext_harshthakkar_google_com@spackopenf-login-login-001 test_run]$

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cloud HPC Toolkit Contribution guidelines #