DOCS-863: clarify GitHub Action debug and TLS guidance

[harrison-akeyless]

Summary

• add a canonical Debug Logging section for GitHub Actions troubleshooting
• clarify that the GitHub runner must trust the Gateway TLS certificate chain before authentication starts
• document how to pass a PEM-encoded CA certificate through the ca-certificate input

Validation

• pre-commit run --files on the edited GitHub Actions doc page
• markdownlint and cspell on the edited page

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9de79e30-554a-40a8-83c1-e75250428d5e

📥 Commits

Reviewing files that changed from the base of the PR and between 2cfce18 and 46ac82a.

📒 Files selected for processing (1)

• docs/Integrations & Plugins/plugins-overview/github-action.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1.0_docs-863-github-action-debug-tls

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