[Bug?]: Can't add a dependency from a private github repo where the dep uses pnpm

[catsalive]

Self-service

• I'd be willing to implement a fix

Describe the bug

Using yarn 3.2.0

Unable to install a dependency from a private github repo that itself uses pnpm as it's package manager. This worked fine in yarn 1.*.

command used: yarn add <package-name>@[email protected]:<org-name>/<package-name>.git#<branch-name>

As soon as I converted the dep package to yarn - it worked fine. I have to assume this is a bug.

Totally guessing, but in https://github.com/yarnpkg/berry/blob/master/packages/yarnpkg-core/sources/scriptUtils.ts
the PackageManager enum has pnpm in it. But later on in the code the workflows map variable has no entry for pnpm in it - which appears to be the issue and why it emits the error: Assertion failed: Unsupported workflow.

To reproduce

• Create a Yarn Berry repo (3.2.0)
• Try to yarn add a dependency from a private github repo which itself uses pnpm as it's package manager
• Witness failure to import with Assertion failed: Unsupported workflow error

Environment

System:
    OS: Windows 10 10.0.19042
    CPU: (12) x64 Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz
  Binaries:
    Node: 12.22.6 - ~\AppData\Local\Temp\xfs-b1a8c68b\node.CMD
    Yarn: 3.2.0 - ~\AppData\Local\Temp\xfs-b1a8c68b\yarn.CMD
    npm: 6.14.15 - C:\Program Files\nodejs\npm.CMD

Additional context

No response

[merceyz]

Duplicate of #3169

[catsalive]

Duplicate of #3169

Gotcha! Sorry for the dupe.