fix: lowercase GHCR image name in release workflow

[rophy]

Summary

• Fix repository name must be lowercase error in release workflow
• Lowercase github.repository before using as Docker image tag (same pattern as redo-log-tests.yaml)

Test plan

• Merge, re-push v1.9.0.1 tag, verify release build succeeds

Summary by CodeRabbit

Release Notes

• Chores
  • Optimized Docker image tagging process in the release workflow for improved consistency and reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: c15e4721-4838-4f63-b869-5dd244a0adb9

📥 Commits

Reviewing files that changed from the base of the PR and between f17a7ce and 9241e3f.

📒 Files selected for processing (1)

• .github/workflows/release.yaml

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📝 Walkthrough

Walkthrough

The release workflow adds an environment variable normalization step. It defines an image name, converts it to lowercase via a dedicated step, and uses the normalized value in Docker build/push tags instead of inline expressions.

Changes

Docker Image Tag Normalization

Layer / File(s)	Summary
Image tag normalization for Docker build/push .github/workflows/release.yaml	Workflow defines env.IMAGE with the repository image path, adds a step to lowercase it and export to GITHUB_ENV, then updates the Docker build/push action to reference the normalized environment variable in tags.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• rophy/OpenLogReplicator#23: Both PRs modify .github/workflows/release.yaml to build/push the release Docker image to GHCR, with this PR specifically changing how the image tag is computed via a lowercased env.IMAGE variable on top of the release workflow introduced in #23.

Poem

A workflow so clean, with lowercase dreams,
Docker tags flow through env.IMAGE streams,
Normalize once, use it twice with grace,
Build and push image to the registry space! 🐇✨

🚥 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 accurately describes the main change: lowercasing the GHCR image name in the release workflow to fix repository name validation errors.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-lowercase

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