Add support for manifest.json

[hadley]

i.e. what rsconnect::writeManifest() since that's what connect cloud is going to use.

[gaborcsardi]

Do you know if the format is documented and/or if there is a schema for it?

[hadley]

No, but my recollection is that it's reasonably straightforward.

[hadley]

manifest.json includes the expected R version so maybe this is a separate workflow that's an alternative to setup-r + setup-renv/setup-r-dependencies.

[github-actions]

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