fix: detect pnpm-workspace.yml and append -w when installing wrangler

[sam-goodwin]

The wrangler-action does not currently support pnpm workspaces.

See: #181 (comment)

It fails with:

📥 Installing Wrangler
  /home/runner/setup-pnpm/node_modules/.bin/pnpm add wrangler@* -w
   ERR_PNPM_ADDING_TO_ROOT  Running this command will add the dependency to the workspace root, which might not be what you want - if you really meant it, make it explicit by running this command again with the -w flag (or --workspace-root). If you don't want to see this warning anymore, you may set the ignore-workspace-root-check setting to true.
Error: The process '/home/runner/setup-pnpm/node_modules/.bin/pnpm' failed with exit code 1
Error: 🚨 Action failed

This change detects a pnpm workspace by also looking for pnpm-workspace.yml file and then selects an install script that appends -w

[sam-goodwin]

I don't think pnpm exec needs to be adjusted.

[sam-goodwin]

I noticed the tests only check that the right config is selected. It would be better to actually run the action within the test folders instead.

[1000hz]

Thanks for the PR! This solution adds a new user-facing value of packageManager: pnpm-workspace distinct from the existing pnpm value. While in most cases it won't be necessary for the user to explicitly specify a value since it will be inferred from the file system, we should still avoid introducing a new value to our public interface to work around this issue.

Let's rework this to dynamically include the -w argument for pnpm when necessary. One way to do this would be to make values of the PACKAGE_MANAGERS object optionally be a function, which we'd invoke before returning in getPackageManager().

[lrapoport-cf]

hey @sam-goodwin :) we haven't heard from you in a while. if you'd still like to get this PR landed, please update in response to @1000hz 's feedback. otherwise, we'll close this PR until you're ready to revisit :) thanks!

[lrapoport-cf]

hey @sam-goodwin :) we haven't heard from you so we'll close this PR for now, but please feel free to re-open when you're ready to revisit. thanks!

[jacob-shuman]

This is currently preventing me from using the wrangler action in my pnpm monorepo. I think this can be automatically inferred (at least for pnpm) by checking for a pnpm-workspace.yaml/pnpm-workspace.yml file in the cwd.

Edit: sorry missed that from the original comment 😂