Add support for setting custom properties of a repository

[gberche-orange]

Describe the feature or problem you’d like to solve

I need to set in batch custom properties on a set of repositories

Proposed solution

How will it benefit CLI and its users?

Collaborate with other org users on using custom properties (e.g. flag some repos as candidate for archiving or deletion)

Additional context

https://docs.github.com/en/organizations/managing-organization-settings/managing-custom-properties-for-repositories-in-your-organization

[benelan]

You could use gh api in the meantime. GitHub's REST API reference includes gh usage snippets, for example:

gh api \
  --method PATCH \
  -H "Accept: application/vnd.github+json" \
  -H "X-GitHub-Api-Version: 2022-11-28" \
  /repos/OWNER/REPO/properties/values \
   -f "properties[][property_name]=environment" -f "properties[][value]=production" -f "properties[][property_name]=service" -f "properties[][value]=web" -f "properties[][property_name]=team" -f "properties[][value]=octocat"

https://docs.github.com/en/rest/repos/custom-properties?apiVersion=2022-11-28#create-or-update-custom-property-values-for-a-repository

[andyfeller]

@gberche-orange : could you share how you are using the custom properties as part of your overall gh workflow?

Beyond setting the value of a custom property for a given repository, there are likely several ways that custom properties should be incorporated into gh more broadly:

1. Custom property management
   1. Listing custom properties at the organization level
   2. View specific custom property at the organization level including property values
   3. Create custom properties at the organization level as a single or batch
   4. Remove custom property at the organization level
2. Applying custom properties on repositories
   1. View custom property set for a given repository
   2. Set custom property value for a given repository### Extended custom property support into other commands
3. Leveraging custom properties
   1. gh search repos