[.gitpod.yml generator] Use 'pnpm' package manager when there is a pnpm-lock.yaml file or the package.json specifies it

[jankeromnes]

Description

When auto-generating a .gitpod.yml, look for a pnpm-lock.yaml file in the root of the repository, or a packageManager entry in package.json that starts with "pnpm". If it's a match, the wanted package manager is likely pnpm (instead of npm or yarn).

Related Issue(s)

Fixes #10374

How to test

1. Open a repository using pnpm (which does not yet have a committed .gitpod.yml) in the preview environment
2. The auto-generated .gitpod.yml should use pnpm (instead of npm or yarn)

Release Notes

[.gitpod.yml generator] Use 'pnpm' package manager when there is a pnpm-lock.yaml file or the package.json specifies it

Documentation

[jankeromnes]

Hint: Reviewing without whitespace changes is easier: https://github.com/gitpod-io/gitpod/pull/10731/files?w=1

[andrew-farries]

We should add a test for this to config-inferrer.spec.ts too.

[gengjiawen]

We should add a test for this to config-inferrer.spec.ts too.

Is there easy way mock ctx for now ?

[jankeromnes]

Is there easy way mock ctx for now ?

@gengjiawen Yes, something like this is already set up here: https://github.com/gitpod-io/gitpod/blob/main/components/server/src/config/config-inferrer.spec.ts

FYI, given that I'll be on holidays for a few weeks -- please feel free to re-appropriate my PR and add a test to the spec file 👍 (or, you can also feel free to leave this hanging, and I'll update this PR when I'm back from holidays 🌴)

[gengjiawen]

@jankeromnes friendly ping

[jankeromnes]

New tests run and pass:

[components/server:app]   config inferrer
[components/server:app]     ✓ [node] yarn
[components/server:app]     ✓ [node] npm
[components/server:app]     ✓ [node] pnpm