fix: update MAPDL image version and remove DPF server activation step in documentation build workflow

[germa89]

Description

Update docker image tag in documentation build workflow.

Issue linked

NA

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)

Summary by Sourcery

Update documentation build workflow to use MAPDL v25.2-ubuntu-cicd image and streamline DPF server activation

CI:

• Switch MAPDL_IMAGE_VERSION_DOCS_BUILD to v25.2-ubuntu-cicd
• Remove the DPF_DOCKER_IMAGE variable and the dedicated DPF server activation step
• Introduce RUN_DPF_SERVER flag and DPF_PORT_INTERNAL environment variable in the workflow run step

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

This PR bumps the MAPDL image version used in the documentation CI workflow and refactors the DPF server activation by removing the standalone activation step, updating environment variables, and enabling inline server startup.

File-Level Changes

Change	Details	Files
Update MAPDL Docker image tag for documentation build	Changed MAPDL_IMAGE_VERSION_DOCS_BUILD from v24.2-ubuntu-student to v25.2-ubuntu-cicd	.github/workflows/doc-build.yml
Refactor DPF server activation in CI workflow	Removed DPF_DOCKER_IMAGE environment variable assignment Deleted the separate 'DPF server activation' step Added DPF_PORT and DPF_PORT_INTERNAL environment variables Enabled inline DPF startup by setting RUN_DPF_SERVER=true	.github/workflows/doc-build.yml

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[Copilot]

Pull Request Overview

This PR updates the documentation build workflow to use a newer MAPDL image version and streamlines the DPF server setup process. The changes consolidate DPF server configuration into the main MAPDL startup script instead of using a separate activation step.

• Updates MAPDL image version from v24.2-ubuntu-student to v25.2-ubuntu-cicd
• Removes dedicated DPF server activation step and integrates DPF configuration into the main MAPDL startup process
• Adds DPF port configuration variables to support the integrated setup

[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (86fa0c0) to head (ab58ff6).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4118      +/-   ##
==========================================
+ Coverage   91.30%   91.32%   +0.01%     
==========================================
  Files         189      189              
  Lines       15649    15650       +1     
==========================================
+ Hits        14289    14292       +3     
+ Misses       1360     1358       -2     

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬