Make gh secret set selected repositories without re-defining the value #9383

Describe the feature or problem you’d like to solve

I need to manage my organization secrets and I want to update the selected repositories.

Kind of how it's done with the dedicated REST API:
https://docs.github.com/en/rest/actions/secrets?apiVersion=2022-11-28#set-selected-repositories-for-an-organization-secret (but with repository names instead of IDs)

At the moment when skipping --body

gh secret set MY_SECRET --org my-org --visibility selected --repos repo1,repo2

it read from reads from standard input:

? Paste your secret:

Proposed solution

How will it benefit CLI and its users?

We can add an extra tag that tells the CLI not to touch the previous secret value at all:

gh secret set MY_SECRET --org my-org --keep-previous-body --visibility selected --repos repo1,repo2

Not sure about the -keep-previous-body tag name.

But for sure I think it will be cumbersome to add an extra gh secret command for that.

Additional context

May be related to:

• secret update #6327