Simplify workflow to only trigger on mcp-v*.*.* tags.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Fix Docker tag format: use version only (0.4.0) instead of mcp-v0.4.0
- Add Python 3.11 setup for tomllib compatibility
- Add workflow_dispatch trigger for testing without creating tags
- Add conditional push logic for manual testing
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>