fix: update Dockerfiles and docker-compose files to use v25.2-ubuntu-cicd and streamline environment variables

[germa89]

Description

As the title.

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 container configurations to use the latest v25.2-ubuntu-cicd image and simplify environment variable management

Enhancements:

• Streamline environment variable handling by moving common flags into Dockerfiles

Build:

• Bump base image to ghcr.io/ansys/mapdl:v25.2-ubuntu-cicd across all Dockerfiles
• Remove hardcoded image and redundant environment settings from docker-compose configurations

[ansys-reviewer-bot]

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@ansys-reviewer-bot review

[sourcery-ai]

Reviewer's Guide

This PR upgrades all devcontainer definitions to use the v25.2-ubuntu-cicd base image and streamlines environment variable handling by removing redundant vars from docker-compose files and centralizing them in the Dockerfiles.

File-Level Changes

Change	Details	Files
Upgraded base images to v25.2-ubuntu-cicd	Replaced FROM ghcr.io/ansys/mapdl:v24.1-ubuntu-student with v25.2-ubuntu-cicd in all Dockerfiles	.devcontainer/codespaces-dev/Dockerfile .devcontainer/codespaces-docs/Dockerfile .devcontainer/devcontainer-local/Dockerfile
Removed static image references and redundant env vars from docker-compose	Deleted image: ghcr.io/ansys/mapdl:v24.1-ubuntu-student entries Removed ON_CI, ON_LOCAL, ON_STUDENT, ON_UBUNTU environment blocks	.devcontainer/devcontainer-local/docker-compose.yml .devcontainer/codespaces-dev/docker-compose.yml .devcontainer/codespaces-docs/docker-compose.yml
Centralized environment variable definitions in Dockerfiles	Added ENV ON_LOCAL=true, ON_UBUNTU=true, ON_CI=true to each Dockerfile	.devcontainer/codespaces-dev/Dockerfile .devcontainer/codespaces-docs/Dockerfile .devcontainer/devcontainer-local/Dockerfile

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[sourcery-ai]

Hey @germa89 - I've reviewed your changes - here's some feedback:

• Hardcoding the v25.2-ubuntu-cicd tag in multiple Dockerfiles will require manual updates on future version bumps—consider using a build ARG or shared base Dockerfile to centralize the image version.
• You’ve removed ON_STUDENT and ON_UBUNTU flags from docker-compose but added ON_CI/ON_LOCAL in Dockerfiles; double-check that any student- or Ubuntu-specific logic elsewhere still behaves correctly without those flags.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬