CLI: Pass package manager to postinstall

[ShaunEvening]

What I did

• Pass the name of the package manager as an option to the postinstall script
• Create a postinstall script for addon-themes
• Don't add ^ to version if the specified version isn't semver (Example : next, canary)

Checklist for Contributors

Testing

Manual testing

1. Open a sandbox of your choosing
2. yarn add -D tailwindcss postcss autoprefixer
3. npx storybook@canary add @storybook/addon-themes@canary
4. @storybook/auto-config should be run to configure tailwind themes

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This pull request has been released as version 0.0.0-pr-23913-sha-45573ae9. Install it by pinning all your Storybook dependencies to that version.

More information

Published version	0.0.0-pr-23913-sha-45573ae9
Triggered by	@ndelangen
Repository	storybookjs/storybook
Branch	shaun/pass-package-manager
Commit	45573ae9
Datetime	Wed Aug 23 14:35:40 UTC 2023 (1692801340)
Workflow run	5952768837

To request a new release of this pull request, mention the @storybookjs/core team.

core team members can create a new canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=23913

[storybook-bot]

Failed to publish canary version of this pull request, triggered by @integrayshaun. See the failed workflow run at: https://github.com/storybookjs/storybook/actions/runs/5939042720