added PR reviewer workflow

[derekmisler]

What I did

Added an automated PR review workflow powered by the shared docker/cagent-action reusable workflow. This enables AI-assisted code review on every new or ready-for-review PR, as well as on-demand via /review in PR comments. The workflow feeds the repo's CLAUDE.md as additional context so reviews are informed by project-specific conventions.

Key details:

• Triggers on PR opened, PR marked ready for review, issue comments, and review comments
• Uses pull_request_target so secrets are available even for fork PRs
• Explicitly passes required secrets rather than using secrets: inherit
• Reviews appear under the docker-agent identity (not the generic github-actions[bot])
• Auto-reviews are gated to org members only via CAGENT_ORG_MEMBERSHIP_TOKEN
• Scoped permissions: read for contents, write for pull-requests and issues

Related issue

Closes https://github.com/docker/gordon/issues/132

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 85814c892f

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[derekmisler]

@cmrigney or @bobbyhouse, you all have any questions/concerns about adding the cagent PR reviewer?

[cmrigney]

@derekmisler Not yet, Bobby is out right now and I've been pre-occupied this week with an upcoming release. But I plan to take a look at it as soon as I have some bandwidth.

[derekmisler]

we're renaming cagent to docker agent, so i'm going to update this PR once i rename the action