test: add npm caching to pnpm examples

[MikeMcC399]

If cypress-io/github-action finds a pnpm-lock.yaml file, it uses the pnpm command pnpm install --frozen-lockfile by default to install dependencies. It does not however cache these dependencies for a future run of the same workflow.

This PR is a workaround to the pnpm example to make up for this missing functionality.

It adds dependency caching of the pnpm store contents using the command pnpm store path to find the location of the store and actions/cache to cache the store contents. This is applied to

• the workflow example-basic-pnpm.yml and to
• the README > pnpm section.

There is no change to the action itself.

• A separate enhancement request is logged under Add dependency caching to pnpm #1044.

Verification

Run the workflow example-basic-pnpm.yml.

Check that each of the caches under github-action/actions/caches

• macOS-pnpm-store-*
• Linux-pnpm-store-*
• Windows-pnpm-store-*

is approximately 6MB large.

Run the workflow example-basic-pnpm.yml again.

Check the logs files and examine each job.

• basic-pnpm-ubuntu-20
• basic-pnpm-ubuntu-22
• basic-pnpm-on-windows
• basic-pnpm-on-mac
• basic-pnpm-binary

Under the step "Cypress tests" look for the line

Progress: resolved 179, reused 179, downloaded 0, added 179, done

The number next to downloaded must be 0.

[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]

@davidr-cy

Are you intending to review this PR?

[davidr-cy]

@MikeMcC399 Sorry about that. I think we tagged the wrong person to review this!

Thanks for the ping, I'll get that sorted out.

[github-actions]

🎉 This PR is included in version 6.6.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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