feat(github-actions): add workflow to automate GitHub release creation

[DecSmith42]

Introduced a new GitHub Actions workflow CreateRelease to automate the process of creating GitHub releases. Added support for tagging specific commits or branches and generating corresponding releases. Enhanced IGithubReleaseHelper with methods for release creation and artifact uploads, along with detailed documentation updates.

[Copilot]

Pull request overview

This PR adds first-class support for creating GitHub Releases from Atom builds and wires it into a new manually triggered GitHub Actions workflow, so releases can be created (and later have assets uploaded) via Atom targets.

Changes:

• Added IGithubReleaseHelper.CreateRelease(...) with a default implementation that creates a GitHub release (optionally targeting a specific branch/SHA) via the GitHub API.
• Introduced a new generated GitHub Actions workflow (CreateRelease) plus corresponding _atom target/workflow definition to run release creation.
• Documented the release helper usage in the GitHub workflows module docs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Invex.Atom.Module.GithubWorkflows/Helpers/IGithubReleaseHelper.cs	Adds CreateRelease(...) helper to create releases (and tags) via Octokit.
Invex.Atom.sln.DotSettings	Adds “Commitish” to the JetBrains user dictionary.
docs/modules/github-workflows.md	Documents release creation and asset upload helpers.
.github/workflows/CreateRelease.yml	Adds the generated manual CreateRelease GitHub Actions workflow.
_atom/Targets/IDeployTargets.cs	Adds CreateGithubRelease target that calls CreateRelease(...).
_atom/IBuild.cs	Adds the CreateRelease workflow definition and GitHub token permissions/secret injection.