feat: docker image for run

[Revathyvenugopal162]

### Unified Docker Image for LS-DYNA with SMP/MPP Support

This PR introduces a unified Docker image for running LS-DYNA simulations through PyDyna's run module, containing both SMP and MPP executables in a single container with automatic mode
detection.

Changes

Docker Infrastructure

• ✅ Consolidated SMP and MPP executables into a single Dockerfile
• ✅ Added OpenMPI support for MPP runs
• ✅ Automated FTP-based download of LS-DYNA executables during build
• ✅ Removed legacy file.sh script
• ✅ Updated docker/run/README.rst with comprehensive build and usage documentation

Docker Runner Enhancements

• ✅ Implemented auto-detection to select SMP vs MPP executable based on solver options
• ✅ Added executable discovery mechanism within container
• ✅ Improved error handling and logging throughout
• ✅ Added graceful handling for Docker SDK import
• ✅ Enhanced environment variable management (OpenMPI flags, licensing)
• ✅ Better container lifecycle management (create, execute, cleanup)

CI/CD Updates

• ✅ Updated nightly CI workflow with Docker build matrix (SMP/MPP testing)
• ✅ Added new publish-run-image.yml workflow for automated image publishing
• ✅ Streamlined PR workflow Docker build steps
• ✅ Removed unused doc-build action steps

Testing

• ✅ Added comprehensive test suite in tests/test_docker_runner.py (461 lines)
• ✅ Covers SMP/MPP modes, precision options, and error conditions

Dependencies

• ✅ Added docker to project dependencies in pyproject.toml

Key Benefits

• Eliminates SMP/MPP mode mismatch issues
• Simplifies deployment with single unified image
• Automatic executable selection reduces user configuration
• Improved error handling and logging for troubleshooting