fix(molecule): give repos_default enough memory for dnf on rockylinux9

[Oddly]

repos_default was running with memory_mb: 512, which is tight enough that dnf on rockylinux9 gets OOM-killed during the security-packages install. The first converge squeaks by but the idempotence re-run triggers the kernel OOM-killer; Ansible reports rc: 137 / "No start of json char found" after three retries and the job fails. An earlier run on the same combo timed out at 30 minutes in idempotence — same root cause, different symptom depending on when the OOM-killer arrived.

Every other molecule scenario uses 2048+; 1024 is enough for a path that runs no services and keeps the container footprint modest.

I will kick off a workflow_dispatch of Test Role repos on this branch once merged to confirm the rockylinux9 + release 8 combo passes end-to-end.

Summary by CodeRabbit

• Chores
  • Updated testing infrastructure configuration to optimize test environment resource allocation and improve performance during automated testing runs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: fe0ce90c-97b0-4e7a-9a98-ecec3e7bbcb7

📥 Commits

Reviewing files that changed from the base of the PR and between 0e190b2 and 50d078b.

📒 Files selected for processing (1)

• molecule/repos_default/molecule.yml

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📝 Walkthrough

Walkthrough

The molecule/repos_default/molecule.yml configuration file is updated to increase the memory allocation for the repos-def-* platform from 512 MB to 1024 MB, with inline comments added to document the adjustment for rockylinux9 idempotence runs.

Changes

Cohort / File(s)	Summary
Molecule Configuration molecule/repos_default/molecule.yml	Memory allocation for repos-def-* platform increased from 512 MB to 1024 MB with explanatory comments for rockylinux9 scenario.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and specifically describes the main change: increasing memory allocation for the repos_default Molecule scenario to fix dnf OOM issues on rockylinux9.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/repos-default-oom

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