Change list workflow runs to allow empty resource id to list all runs in repo

[mattdholloway]

Summary

This pull request improves the flexibility of the workflow list method by making the resource_id parameter optional for the list_workflow_runs method. This allows users to list all workflow runs in a repository without specifying a workflow ID or file name.

Why

Fixes #

What changed

• Made resource_id optional for the list_workflow_runs method; if omitted, all workflow runs in the repository are listed. This is reflected in both the schema and the code logic. [1] [2]
• Updated validation so that missing resource_id is no longer treated as an error for list_workflow_runs.
• Modified tests to verify that listing workflow runs without a resource_id returns all runs and does not produce an error. [1] [2]

MCP impact

• No tool or API changes
• Tool schema or behavior changed
• New tool added

Prompts tested (tool changes only)

Security / limits

• No security or limits impact
• Auth / permissions considered
• Data exposure, filtering, or token/size limits considered

Tool renaming

• I am renaming tools as part of this PR (e.g. a part of a consolidation effort)
  • I have added the new tool aliases in deprecated_tool_aliases.go
• I am not renaming tools as part of this PR

Note: if you're renaming tools, you must add the tool aliases. For more information on how to do so, please refer to the official docs.

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test

Docs

• Not needed
• Updated (README / docs / examples)

[Copilot]

Pull request overview

This PR enhances the actions_list tool by making the resource_id parameter optional for the list_workflow_runs method. When resource_id is omitted, all workflow runs in the repository are listed instead of being limited to a specific workflow.

• Added support for listing all workflow runs in a repository without specifying a workflow ID or filename
• Updated validation logic to allow empty resource_id for list_workflow_runs while maintaining required validation for other methods
• Enhanced test coverage to verify the new optional parameter behavior

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pkg/github/actions.go	Updated validation logic to allow empty resource_id for list_workflow_runs and added conditional logic to call ListRepositoryWorkflowRuns when resource_id is not provided
pkg/github/actions_test.go	Converted the error-checking test to a success test that verifies listing all workflow runs without resource_id works correctly
pkg/github/toolsnaps/actions_list.snap	Updated tool schema to remove resource_id from required fields and updated its description to document the new optional behavior
README.md	Updated documentation to reflect that resource_id can be omitted for list_workflow_runs to list all runs