PPNA-5781 Don't run version-update on skipped workflows (commits with "[skip ci]" etc)

[mrfijas]

WiP

[Copilot]

Pull request overview

Updates the version-update/trigger composite action so it does not dispatch version-update workflows when the source commit indicates CI should be skipped (e.g., [skip ci]), including when invoked from a workflow_run-based workflow.

Changes:

• Derive source_sha/source_ref for both normal events and workflow_run, and surface them via outputs.
• Detect GitHub Actions skip directives in the source commit message and skip dispatching when present (with a skip_reason output and updated summaries).
• Document the new skip behavior in the README.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
version-update/trigger/action.yaml	Adds commit-message skip detection and workflow_run source SHA/ref handling; enriches outputs and summary text.
README.md	Documents skip-directive behavior for dev commits and tags, including workflow_run usage.

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[mrfijas]

cursor review

[jzyinq]

@cursor review

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.