Export PrivacyInfo.xcprivacy

[mjburghard]

Export PrivacyInfo.xcprivacy file to allow users of protobuf to access the file from Bazel, e.g. to bundle it with an iOS application.

[acozzette]

@mjburghard Could you rebase your branch against main and push it again? I believe that will fix the test failures.

[thomasvl]

I don't actually know what the bazel rules are doing for CC or ObjC libraries to collect privacy manifest info. I would think something has to merge the data as other targets might need the info also.

Is exporting the file required, or do the rules use an aspect to collect the data from the whole graph an merge it?

[mjburghard]

@thomasvl I am not aware of any standard or any aspect that handles privacy manifests. One way possibility is to mimic the bundle spm would create using rules_apple and adding that as a data dependency. We currently do this in our repo, but have to copy the manifest as the file is not accessible at the moment.
This PR only enables access for further handling by a user of protobuf.

[thomasvl]

Approving, but just copying the file likely isn't right since you'll need to merge it with the information for the rest of your code.

[mjburghard]

Yeah, this is part of a more elaborate setup.

[mjburghard]

Are there any steps I can do to resolve the CI failure?