CI/CD workflow only builds Ruby 3.4 image, missing multi-version support

[landovsky]

Current Behavior

The GitHub Actions workflow (.github/workflows/docker-build-push.yml) only builds a single Docker image with Ruby 3.4.7, tagged as:

• landovsky/claude-sandbox:0.1.1 (semantic version)
• landovsky/claude-sandbox:latest

Expected Behavior

The workflow should build separate images for each Ruby version defined in ruby-versions.yaml, matching the local build behavior:

• landovsky/claude-sandbox:ruby-3.2 (Ruby 3.2.6)
• landovsky/claude-sandbox:ruby-3.3 (Ruby 3.3.6)
• landovsky/claude-sandbox:ruby-3.4 (Ruby 3.4.7)
• landovsky/claude-sandbox:latest (→ ruby-3.4)

Impact

Current workaround: Projects using Ruby 3.4.x will work fine.

Limitation: Projects requiring Ruby 3.2 or 3.3 cannot use remote sandbox sessions, as the launcher will attempt to pull non-existent image tags (e.g., landovsky/claude-sandbox:ruby-3.2).

Root Cause

The local build script (bin/claude-sandbox build) correctly parses ruby-versions.yaml and builds multiple images (lines 406-451), but the CI/CD workflow hardcodes a single build.

Fix

Update the workflow to:

1. Parse ruby-versions.yaml (could use yq or parse in bash)
2. Use a matrix strategy to build each Ruby version
3. Push all version-specific tags plus semantic version tags

References

• Local build logic: bin/claude-sandbox lines 419-437
• Local push logic: bin/claude-sandbox lines 467-479
• Current workflow: .github/workflows/docker-build-push.yml

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Status: Known limitation. The maintainer currently uses Ruby 3.4.7, so this isn't blocking immediate work, but will be addressed for broader compatibility.