ci: add workflow_dispatch for feature branch builds

[wcatz]

Summary

• Adds workflow_dispatch trigger with custom tag input to the Docker build workflow
• Enables multiarch image builds from any branch without merging to master
• Login + push enabled for dispatch events (not just push to master/tags)

Test plan

• Merge this PR
• Trigger manually via gh workflow run against feat/raw-gouroboros-live-tail with tag 3.1.0-rc1

Summary by CodeRabbit

• New Features

  • Added manual workflow trigger for Docker builds with custom tag input.

• Chores

  • Optimized GitHub Actions workflow conditions and image tag calculations for improved CI/CD efficiency.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The GitHub Actions Docker build-push workflow has been enhanced to support manual triggering via workflow_dispatch with custom tag input. Login, metadata, and push conditions are updated to accommodate this new trigger type while maintaining existing push and pull request behaviors.

Changes

Cohort / File(s)	Summary
Docker Build/Push Workflow .github/workflows/docker-build-push.yml	Added workflow_dispatch trigger with tag input. Updated login condition to exclude pull requests. Metadata extraction now skips workflow_dispatch events. Build/push logic now handles custom tags from workflow_dispatch input, falling back to metadata outputs for other events. VERSION build-arg sourced from input tag (workflow_dispatch) or github.ref_name (push).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix(ci): hardcode Docker Hub username in image metadata #90: Modifies the same Docker workflow's image metadata and tag handling, overlapping on image naming logic.
• fix(workflow): quack #15: Updates the same workflow with tag condition adjustments and explicit VERSION build-arg configuration.

Poem

🐰 A workflow so grand, now dispatched by hand,
With tags custom-made, our Docker expands!
No pull request walls, just manual control—
This rabbit hops forward with versioning soul! 🚀

🚥 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 accurately summarizes the main change: adding workflow_dispatch trigger support to the Docker build workflow for feature branch builds.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/ci-workflow-dispatch

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