The hashFiles function in the Github Actions expression language can support multiple patterns: https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#hashfiles

It would be nice for the cache step in this repo to support that also, by taking a List Text instead of a single Text. I started to prepare a PR for this but got lost in apparent duplication: what is the design intent between steps/cache.dhall and steps/actions/cache.dhall? dhall hash says that they're identical. Is one deprecated?