Update GitHub Copilot guidance, enhance Docker build caching, and modify workspace settings

[ptr727]

Signed-off-by: Pieter Viljoen ptr727@users.noreply.github.com

[Copilot]

Pull request overview

This PR corrects the version number in README.md from 3.0 to 2.9, updates GitHub Actions workflow references, enhances Docker build caching strategy, improves documentation formatting, and updates workspace settings.

Changes:

• Corrected version number from 3.0 to 2.9 in README.md and updated workflow reference shield to use publish-release.yml
• Enhanced Docker build caching strategy to use branch-specific and image-specific scopes to prevent cache space issues
• Improved formatting in GitHub Copilot guidance and workflow files, and added "tagsargs" to workspace dictionary

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Corrected version from 3.0 to 2.9, updated workflow reference in build status shield
NxWitness.code-workspace	Added "tagsargs" to spell-check dictionary
HISTORY.md	Added note about GHA cache usage improvements to version 2.9
.github/workflows/publish-docker-readme-task.yml	Fixed indentation and upgraded dockerhub-description action to v5
.github/workflows/build-docker-task.yml	Restructured Docker build caching to use branch and image-specific scopes
.github/copilot-instructions.md	Added blank lines between sections for improved readability

[Copilot]

The cache-to configuration uses scope=ro for branches that are not 'main' or 'develop'. The scope parameter is for naming the cache, not for setting permissions. If the intention is to not write to cache for other branches, consider omitting the cache-to parameter entirely or setting it to an empty string, rather than using an arbitrary scope name like 'ro'.

Suggested change

	cache-to: ${{ (github.ref_name == 'main' || github.ref_name == 'develop') && format('type=gha,mode=max,scope={0}-{1}', github.ref_name, matrix.images.Name) || 'type=gha,mode=min,scope=ro' }}
	cache-to: ${{ (github.ref_name == 'main' || github.ref_name == 'develop') && format('type=gha,mode=max,scope={0}-{1}', github.ref_name, matrix.images.Name) || '' }}