Is there a pulumi built in variable mentioning the update reference? I want to put a comment on a resource (Cloudflare DNS record) showing the particular update ID that deployed the record, so I can see when it changes and more easily identify which records are linked to which stack and which update/deployment. Currently I'm setting the comment to "Managed by Pulumi" but would like it to be "Managed by Pulumi. XYZ" where XYZ is some kind of unique dynamically updated ref. I searched here https://www.pulumi.com/docs/languages-sdks/yaml/yaml-language-reference/ and on google but didn't seem to find anything.