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Is <https://www.pulumi.com/docs/guides/continuous-delivery/github-actions/> only compatible with the Pulumi service? Seems like using a storage backend doesn't work.
`error: PULUMI_ACCESS_TOKEN must be set for login during non-interactive CLI sessions`

Looks like currently yes. 

An env var for specifying they `PULUMI_BACKEND` could be added to <https://github.com/pulumi/pulumi/blob/master/dist/actions/entrypoint.sh|https://github.com/pulumi/pulumi/blob/master/dist/actions/entrypoint.sh> to support this. 

PRs definitely welcome!  (And great free to at least open an issue with the suggestion). 

done for Azure: <https://github.com/pulumi/pulumi/pull/4223>
Not sure how you want me to update the `changelog.md` though