docs+docker: Complete documentation infrastructure with Docker automation testing (#2)

* fix: Remove invalid colon in bash else statement

- Fix bash syntax error in auto-version workflow
- Remove Python-style colon from else statement
- Resolves exit code 127 in version bump determination

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* feat: Add Docker build combinations for non-versioning prefixes

- Add support for prefix+docker combinations (docs+docker:, chore+docker:, etc.)
- Enable Docker build for non-versioning changes when requested
- Add repository_dispatch trigger for Docker workflow
- Update Docker tagging for PR-based builds (pr-X, main-sha)
- Update PR template with new prefix options

This allows contributors to force Docker builds for documentation,
maintenance, and other non-versioning changes when needed.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: Add comprehensive PR prefix and automation documentation

- Update CONTRIBUTING.md with detailed PR prefix system explanation
- Add automation workflow documentation to docs/contributing/workflows.md
- Create new user-friendly contributing guide at docs/user-guides/contributing-guide.md
- Include Mermaid diagrams for workflow visualization
- Document Docker testing combinations and image tagging strategy
- Add best practices and common mistakes to avoid

This provides clear guidance for contributors on using the automated
versioning and Docker build system effectively.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Patryk Ciechanski <patryk.ciechanski@inetum.com>
Co-authored-by: Claude <noreply@anthropic.com>

docs/README.md

@@ -94,6 +94,7 @@ This project follows the **[CLAUDE.md Collaboration Framework](../CLAUDE.md)** w
 ### Project Information
 - **[Main README](../README.md)** - Project overview and quick start
 - **[Contributing Guidelines](../CONTRIBUTING.md)** - How to contribute to the project
+- **[Quick Contributing Guide](user-guides/contributing-guide.md)** - Simple guide for new contributors
 - **[License](../LICENSE)** - MIT License details
 - **[Collaboration Framework](../CLAUDE.md)** - Development collaboration patterns