Fix release procedure to use CentOS Stream9 for 4.20 and older versions

[ggiguash]

Resolves #191

Successful test of the release flow in this build.

Summary by CodeRabbit

• Chores
  • Enhanced the release workflow to dynamically determine build image tags based on version parameters instead of using a fixed configuration.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The release workflow now dynamically computes the bootc image tag based on the release version. A new step parses the git reference to determine which bootc stream to use, defaulting to stream10 but downgrading to stream9 for older release-4.x versions, then passes this value to the build step.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow .github/workflows/release.yaml	Adds "Determine bootc stream version" step that computes bootc-image-tag conditionally based on ushift-gitref input (stream10 default, stream9 for release-4.x with yver < 21); updates build step to consume computed tag instead of hard-coded value

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Switch to the latest Fedora image for builders tests #129: Modifies bootc-image-tag usage in GitHub Actions workflows with alternative tag resolution.
• Switch to building CS10 bootc images in release workflow #171: Adds bootc-image-tag as an action input to release.yaml, complementing the dynamic tag computation introduced here.

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: fixing the release procedure to use CentOS Stream 9 for 4.20 and older versions, which matches the core objective of the PR.
Linked Issues check	✅ Passed	The PR implements the requested feature from issue #191 by dynamically determining the bootc image tag (defaulting to stream10, downgrading to stream9 for older release versions), enabling successful builds on CentOS Stream 9 for version 4.20.
Out of Scope Changes check	✅ Passed	All changes are scoped to the release workflow file and directly address the issue of fixing 4.20 builds by conditionally selecting the appropriate CentOS Stream version.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

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[ggiguash]

@coderabbitai review

[coderabbitai]

✅ Actions performed

Review triggered.

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[kasturinarra]

/lgtm