Pipelines support

[msolanik]

No description provided.

[Copilot]

Pull request overview

This PR introduces basic CI/CD and dependency management pipelines for the Geliosphere project, along with minor configuration updates to support those pipelines.

Changes:

• Add Renovate configuration and a scheduled GitHub Actions workflow to automate dependency updates (including Docker and CMake dependencies via regex manager).
• Add a documentation workflow to generate and publish Doxygen-based docs from the cuda_cli_config configuration file.
• Add a CPU-only CI build workflow using CMake and update the base CUDA image in the Dockerfile; also tighten CMake policy settings.

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
renovate.json	Defines Renovate behavior, grouping rules, ignored paths, and a regex manager to track CMake GIT_TAG versions from GitHub tags.
Dockerfile	Updates the CUDA base image to 11.6.1-devel-ubuntu20.04, aligning the container with a newer CUDA toolchain.
CMakeLists.txt	Sets the CMake policy version explicitly to 3.14 and cleans up a redundant comment, improving build determinism.
.github/workflows/renovate.yml	Adds a scheduled and manually-triggerable Renovate workflow to run against this repository using the shared renovate.json config.
.github/workflows/documentation.yml	Adds a Doxygen generation and publication workflow driven by the cuda_cli_config configuration and actions-gh-pages.
.github/workflows/ci-build.yml	Introduces a CPU-only CI build workflow that configures and builds the project with CMake on pull requests to main.

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