test: set side-effects-cache=false for pnpm

[MikeMcC399]

• closes "Cypress binary missing" error using pnpm cache #1363

Issue

Caching the pnpm store with default settings leads pnpm to skip running the Cypress postinstall script if the Cypress npm module is already cached. This may lead to failures if the Cypress cache is lost or purged.

Workflows should never depend on the presence of particular caches. They should always be resilient to missing caches.

Change

Add side-effects-cache=false using an .npmrc file to the:

• README > pnpm section
• examples/basic-pnpm project
• examples/start-and-pnpm-workspaces project

Verification

1. Run workflow for basic-pnpm
2. Delete Cypress caches cypress-win23-* / cypress-darwin-* / cypress-linux-* in the branch under test
3. Run workflow again and confirm that Cypress tests are run and are successful

[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.

[github-actions]

🎉 This PR is included in version 6.7.12 🎉

The release is available on:

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

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