test: add yarn modern caching

[MikeMcC399]

Situation

• relates to Package manager caching strategy for pnpm and Yarn Modern #1366

If cypress-io/github-action detects yarn.lock it assumes that Yarn v1 Classic is being used and designates ~/.cache/yarn as the cache folder.

yarn.lock is used by both Yarn v1 Classic and by Yarn Modern.

In the case of Yarn Modern, executing yarn config get cacheFolder on Linux shows that the cache is located in ~/.yarn/berry/cache.

~/.cache/yarn is the wrong folder for Yarn Modern. ~/.yarn/berry/cache is the correct folder to use for Yarn Modern.

Change

For the Yarn Modern examples add actions/setup-node, which offers the built-in optional functionality of caching npm/yarn/pnpm dependencies. It supports Yarn 1 Classic and Yarn Modern.

Workflows:

• .github/workflows/example-yarn-modern.yml
• .github/workflows/example-yarn-modern-pnp.yml

README sections

• Yarn Modern
• Yarn Plug'n'Play

Verification

Run workflows manually:

• .github/workflows/example-yarn-modern.yml
• .github/workflows/example-yarn-modern-pnp.yml

Check cache for presence of the following, for each of the above two workflows:

cypress-linux-x64*
node-cache-Linux-x64-cache*

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

• Leaving in draft state until Bump @actions/cache to min v4.0.1 - Warning cache not found actions/setup-node#1233 is resolved, otherwise a caching issue causes an annotation