CLI: Add --config-dir flag to migrate command

[yannbf]

Closes #

What I did

This PR adds a flag to the migrate so users can specify the config-dir of their Storybooks. This is mostly useful for the mdx-to-csf migration.

Checklist for Contributors

Testing

This was tested manually.

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

1. Run a sandbox for template, e.g. yarn task --task sandbox --start-from auto --template react-vite/default-ts
2. Run `path/to/cli/bin/index.js migrate --config-dir
3. The command should not fail

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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-26721-sha-65e66987. Try it out in a new sandbox by running npx storybook@0.0.0-pr-26721-sha-65e66987 sandbox or in an existing project with npx storybook@0.0.0-pr-26721-sha-65e66987 upgrade.

More information

Published version	0.0.0-pr-26721-sha-65e66987
Triggered by	@ndelangen
Repository	storybookjs/storybook
Branch	yann/add-config-dir-flag-to-migrate
Commit	65e66987
Datetime	Wed Apr 3 20:08:02 UTC 2024 (1712174882)
Workflow run	8544854995

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=26721

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