ci: skip docs validation for dependabot PRs

[cusma]

No description provided.

[Copilot]

Pull request overview

Updates the docs validation workflow to avoid running docs checks for Dependabot-authored pull requests, keeping required checks green while reducing CI work.

Changes:

• Add a Dependabot PR detection step that sets an is_dependabot output.
• Skip checkout and docs change detection when the PR is identified as Dependabot.

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[Copilot]

Pull request overview

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

Comments suppressed due to low confidence (2)

.github/workflows/docs-ci.yaml:62

• The condition at line 62 will fail for workflow_dispatch and workflow_call events because github.event.pull_request will be null/undefined in those contexts. This step needs to check github.event_name first to avoid evaluation errors. The condition should be: github.event_name != 'pull_request' || github.event.pull_request.user.login != 'dependabot[bot]'

              - 'docs/**'

.github/workflows/docs-ci.yaml:39

• The new dependabot skip message step will run but then the workflow stops at line 41 because no checkout occurs for dependabot PRs. This means the job succeeds early. However, consider whether this is the intended behavior or if you want to explicitly exit with success. The current implementation relies on subsequent steps being skipped, which works but may not be immediately clear. Consider adding a comment explaining this flow or using a job-level condition instead.

      - name: Checkout source code (PR)
        if: github.event_name == 'pull_request'
        uses: actions/checkout@v6

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