Support for compact cluster installation

[josecastillolema]

Description

Support for compact cluster deployments. The number of workers (worker_count) must be set to 0.

Fixes # (issue)

Type of change

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] This change is a documentation update

Testing

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• [ ] Test B

Test Configuration:

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• [ ] I have performed a self-review of my own code
• [ ] If a change is adding a feature, it should require a change to the README.md and the review should catch this.
• [ ] If the change is a fix, it should have an issue. The review should make sure the comments state the issue (not just the number) and it should use the keywords that will close the issue on merge.
• [ ] A change should not be merged unless it passes CI or there is a comment/update saying what testing was passed.
• [ ] PRs should not be merged unless positively reviewed.

[dustinblack]

As I'm refreshing my memory, I thought that JetSki already allowed for deployments with zero worker nodes. We even default the worker count to 0:

https://github.com/redhat-performance/JetSki/blob/ab0bba1094226119fca1f7feb4bdc3b73d6c67e9/ansible-ipi-install/group_vars/all.yml#L44

IIRC the OpenShift installer automatically sets the masters/controllers as schedulable if there are no workers. Do you have a case where this isn't true and the manifest from this PR is explicitly required?

[josecastillolema]

I was not aware that JetSki already allowed for deployments with 0 workers (and that the installer would automatically set the masters/controllers as schedulable). Dropping this PR.