Merging policies for this repository

Are there any merging policies for this repository? I checked [contrib.md](https://github.com/common-workflow-language/cwl-v1.2/blob/main/contrib.md) but I could not find descriptions of it. It would be nice if there is a document for it.

For example:
- When a PR includes new tests, should we confirm that cwltool passes the given tests?
- Currently CI does not check it.
- Who can merge pull requests?
- Note: this question is about the policy for this repository rather than the permissions in Github.
- Are any approvals needed before merging?
- one approval, several approvals or approvals of specific members are needed?

Start by reviewing contrib.md and the existing CI behavior mentioned in the issue, including how cwltool is expected to validate new tests. Resolve the repository's questions about test validation, merge authority, and required approvals, then document the agreed policy in a suitable repository document.

Written by the indexing model from the issue text.