feat: add Docker Compose files for testing PyMAPDL

[germa89]

Description

Attempting to move towards a docker-compose compatible testing setting.

Changes

• Add comprehensive Docker testing infrastructure
• Include multi-profile Docker Compose configuration
• Add testing Dockerfile with multiple build targets
• Support both local and remote MAPDL testing scenarios
• Reorganize Docker MAPDL files structure

Issue linked

Instead of #4186

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[Copilot]

Pull Request Overview

This PR introduces a comprehensive Docker testing infrastructure for PyMAPDL, enabling testing against various MAPDL installation configurations through a flexible Docker Compose setup with multiple profiles.

Key changes:

• Added multi-profile Docker Compose configuration supporting local/remote and container/host MAPDL testing scenarios
• Created multi-stage Dockerfile with dedicated build targets for different testing configurations
• Reorganized Docker files into separate MAPDL and testing directories

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docker/testing/start.sh	Test execution script with branch checkout and pytest configuration
docker/testing/mylocal.ip	IP configuration file for MAPDL v261+ compatibility
docker/testing/docker-compose.yml	Multi-profile compose configuration for various MAPDL/PyMAPDL testing combinations
docker/testing/Dockerfile	Multi-stage build with python-main, test targets, and MAPDL local container support
docker/MAPDL/make_container.rst	Documentation for creating custom MAPDL Docker containers
docker/MAPDL/docker-compose.yml	Compose file for running MAPDL and optional DPF services
docker/MAPDL/Dockerfile	Multi-stage Dockerfile for building MAPDL containers from local installations
docker/MAPDL/.dockerignore	Comprehensive exclusion list for MAPDL 2025R1 Docker builds

Comments suppressed due to low confidence (1)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.24%. Comparing base (bdc8a68) to head (064f760).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4274      +/-   ##
==========================================
- Coverage   91.27%   91.24%   -0.04%     
==========================================
  Files         196      196              
  Lines       15977    15977              
==========================================
- Hits        14583    14578       -5     
- Misses       1394     1399       +5     

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