Fix install commands for different yarn versions

[alexeyr-ci]

Summary

The install command given for Yarn Classic only works for Yarn Berry. The command given for Yarn Berry works, but only due to backward compatibility. See https://yarnpkg.com/cli/install:

If the --immutable option is set (defaults to true on CI), Yarn will abort with an error exit code if the lockfile was to be modified (other paths can be added using the immutablePatterns configuration setting). For backward compatibility we offer an alias under the name of --frozen-lockfile, but it will be removed in a later release.

Separately, removed a duplicate sentence.

Pull Request checklist

• ~[ ] Add/update test to cover these changes~
• [x] Update documentation
• ~[ ] Update CHANGELOG file~

Other Information

Summary by CodeRabbit

• Documentation
  • Updated upgrade guide for Shakapacker from v7 to v8, detailing significant changes and best practices.
  • Emphasized the importance of setting the SHAKAPACKER_ASSET_HOST environment variable.
  • Clarified the necessity of the packageManager property in package.json.
  • Noted the renaming of the check_yarn rake task to check_manager.
  • Highlighted the requirement for manual installation of JavaScript dependencies prior to asset compilation.

[coderabbitai[bot]]

Walkthrough

The changes in this pull request detail the upgrade from Shakapacker v7 to v8, highlighting the removal of deprecated functions, a shift to package manager-agnostic dependency management, and the discontinuation of support for Ruby 2.6 and Node v12. Key updates include the necessity of setting the SHAKAPACKER_ASSET_HOST environment variable, the renaming of the check_yarn rake task to check_manager, and the removal of all references to webpacker. Additionally, automatic installation of JavaScript dependencies during asset precompilation has been eliminated, requiring users to manage dependencies manually.

Changes

File

Change Summary

docs/v8_upgrade.md

- Removed deprecated functions and features. - Transitioned to package manager-agnostic approach. - Discontinued support for Ruby 2.6 and Node v12. - Retained behavior of omitting CDN asset host but requires careful asset compilation management. - packageManager property in package.json is now essential. - Renamed check_yarn to check_manager. - Removed all references to webpacker. - JavaScript dependencies no longer installed automatically during assets:precompile. - Enabled ensure_consistent_versioning by default. - Updated function usage: globalMutableWebpackConfig → generateWebpackConfig(). - Stripped additional_paths and removed several miscellaneous functions.

Possibly related PRs

• 524: Allow loading webpack.config.ts if present - This PR introduces the ability to load a TypeScript configuration file for webpack, which aligns with the main PR's changes regarding the handling of configuration files and the transition to a more flexible setup.

Suggested reviewers

• G-Rath
• justin808
• tomdracz

🐰 In the garden, changes bloom,
Shakapacker sheds its gloom.
From v7 to v8, we leap and bound,
With new paths and tasks profound.
Dependencies we now must tend,
A brighter future, around the bend! 🌸

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