ci: Add comprehensive summary for build

[DennisDyallo]

This pull request introduces enhancements to the GitHub Actions workflows to improve build summaries and streamline the handling of Docker image tags in the documentation upload process. Key changes include adding a new job for generating build summaries, defining outputs for reusable workflows, and making Docker image tags accessible for downstream jobs.

Enhancements to build workflows:

• .github/workflows/build.yml: Added a new build-summary job to generate a comprehensive build summary, including job statuses, artifact links, and conditional Docker image tag information. The job runs regardless of other job failures and uses outputs from dependent jobs.

Improvements to documentation upload workflow:

• .github/workflows/upload-docs.yml: Defined an output (image-tag) for the reusable workflow to expose the full tag of the pushed Docker image.
• .github/workflows/upload-docs.yml: Added an image-tag output to the upload_docs job, making the Docker image tag accessible for downstream workflows.
• .github/workflows/upload-docs.yml: Enhanced the Push Docker image step by introducing an ID (push_image) to reference its outputs and using GITHUB_OUTPUT to store the full image tag.