Add workflow to auto-close linked playground items when PRs close

[Copilot]

Adds test-scenario-cleanup.yml workflow to automatically clean up test scenario PRs/issues in dotnet/aspire-playground when a PR closes in the main repository. Only closes items tagged with auto-close label.

Triggers

• Automatic: When any PR is closed
• Manual: Comment /test-scenario-cleanup on a PR

Implementation

• Searches PR body and comments for playground references via GraphQL
• Filters by auto-close label before closing
• Uses GH_PLAYGROUND_TOKEN secret for playground authentication (same pattern as test-scenario.yml)
• Handles both issues and PRs, skips already-closed or unlabeled items
• Posts summary comment on manual invocation

Example

PR contains:

Fixes https://github.com/dotnet/aspire-playground/issues/123
See https://github.com/dotnet/aspire-playground/pull/456

On PR close:

• Issue #123 with auto-close → closes automatically
• PR #456 without auto-close → skipped

Original prompt

I want you to create a workflow that triggers when a PR is closed that gets the list of PRs and issues on the dotnet/aspire-playground repository that are linked to the PR that was just closed and closes them.

However only close the PRs and issues in the dotnet/aspire-playground repo linked where they have the "auto-close" tag applied.

In order to authenticate to the dotnet/aspire-playground repo you will need to use the GH_PLAYGROUND_TOKEN secret. Review the test-scenario.yml workflow for how it is structured around authentication and permissions.

The new workflow should be called test-scenario-cleanup.yml and it should also be able to be triggered by the comment /test-scenario-cleanup for when we want to clean up the PRs and issues in the playground repo.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[mitchdenny]

@radical input?