Fix create-astro pnpm dependencies installation

[HiDeoo]

Changes

When running the latest version of create-astro with pnpm, I'm getting the following error:

▲  error Error
▲  error Dependencies failed to install, please run pnpm install to install them manually after setup.
✔  Project initialized!
■ Template copied
■ Dependencies installed

After adding some logging, the underlying issue seems to be:

ERR_PNPM_MISSING_PACKAGE_NAME  `pnpm add` requires the package name

In #13395, the install() function was updated to use pnpm add instead of pnpm install without a changeset so it ended up being released 2 days ago with version 4.11.2. This PR reverts that change.

The install() function seems to only be meant to install all dependencies (and never a single package) so I'm not sure if there is a reason I'm potentially missing for the change or not.

Testing

I tested locally using node create-astro.mjs but I don't know how to force a specific package manager with this method so I temporarily hardcoded pnpm. Without the fix, I properly reproduced the error. After the fix, the issue seems to be resolved.

Looks like most of the tests for create-astro are using dryRun: true so not sure if/how we should add a test for this.

Docs

This is a bug fix that does not require any documentation change.

[changeset-bot]

🦋 Changeset detected

Latest commit: a957478

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR