Add registry option to publishConfig

[WhiteKiwi]

Describe the user story

I proceeded with the registry migration using nexus group.

I did group legacy-registry and new-registry. 
group-registry is used for reading.
new-registry is used for uploading.

There are currently two ways to solve this issue.
1. modify pnpm registry config just before uploading
2. set publicConfig.registry and using npm

I want to use publishConfig.registry in pnpm because method 2 looks neat.
Currently, I use npm only for publishing.

Describe the solution you'd like

This issue is resolved if pnpm supports publishConfig.registry.

Describe the drawbacks of your solution

Additional work is needed, and I don't think there will be many situations where read repo and write repo are different.

Describe alternatives you've considered

The alternative is described above.

It is written using a translator. Please comment if you don't understand anything.
Thank you for reading.

[KSXGitHub]

pnpm just calls npm publish though. Do publishConfig not get passed to npm? Have you tried it?

[WhiteKiwi]

I was late to check
thank you!