fix(openstack): correct cloud config template for dynamic networks and disk types

[neddp]

• Move range/reserved/static/gateway inside manual-only guard so dynamic networks don't emit range: null
• Replace hardcoded gp2 disk type default with empty cloud_properties when no volume_type is set (gp2 is AWS-specific; OpenStack uses Cinder default)
• Fix README comment: volume_type has no default for OpenStack

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: a5876a81-2c0a-4745-a2bb-4bb5c529668b

📥 Commits

Reviewing files that changed from the base of the PR and between 252eb20 and 24a22dd.

📒 Files selected for processing (2)

• README.md
• templates/cloud_config_openstack.yml.erb

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Walkthrough

The OpenStack cloud configuration template now emits azs for every subnet and limits range to manual networks. Disk types use the configured volume_type; when it is absent, the template emits empty cloud_properties instead of defaulting to gp2. The README now documents that the CPI/Cinder default applies when volume_type is unspecified.

Merge Risk: ⚪ Minimal · up to 24a22

The OpenStack configuration updates correctly scope manual-network fields and let Cinder use its default volume type when none is configured. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the OpenStack cloud configuration fixes for dynamic networks and disk types. It accurately summarizes the main changes.
Description check	✅ Passed	The description directly explains each change in the pull request, including the manual-network guard, the removal of the hardcoded gp2 default, and the README correction.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-openstack-cloud-config-template

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