fix: explictly use docker runtime on minikube

[kaiokmo]

The latest ubuntu-latest runner image (20260831 -> 20260907) switched the default container runtime from docker to containerd, causing CI to break. We are now pinning minikube to use docker runtime.

Similar to ansible/galaxy-operator#291

Summary by CodeRabbit

• Bug Fixes
  • Improved CI environment startup by explicitly selecting the Docker container runtime for Minikube-based checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 49839b3f-b3e3-4cbb-995a-d9b9019247ff

📥 Commits

Reviewing files that changed from the base of the PR and between a4646fc and feae7c0.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/pr.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

Both CI workflows now pass --container-runtime=docker to minikube start. Existing Minikube startup options remain unchanged.

Changes

Minikube Runtime Configuration

Layer / File(s)	Summary
Configure Docker runtime .github/workflows/ci.yml, .github/workflows/pr.yml	Both Minikube startup commands explicitly select the Docker container runtime. The existing startup flags remain in place.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: explicitly selecting the Docker runtime for Minikube.
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)

• Commit to this branch
• Create a new PR

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud