test: remove pnpm store caching

[MikeMcC399]

• closes Sporadic cypress binary cache failure of example-basic-pnpm workflow on Ubuntu #1179

Issue

Workflows such as .github/workflows/example-basic-pnpm.yml, which attempt to cache the contents of the pnpm store, fail sporadically, especially after there has been a change in the version of Cypress and where pnpm workflow jobs are running in parallel.

If the cache of the pnpm store cache is loaded with the cypress module, through steps outside of the Cypress GitHub action, and the Cypress binary has not been successfully cached by the action, then Cypress fails with a verification error.

There is no mechanism available to coordinate these two different caching mechanisms. (See also #1179 (comment) for further explanation.)

Change

pnpm store caching is removed from the documentation:

README > pnpm

and replaced by text which recommends against this caching.

The following workflows are amended accordingly:

• .github/workflows/example-basic-pnpm.yml
• .github/workflows/example-start-and-pnpm-workspaces.yml

Related

• Add dependency caching to pnpm #1044

[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]

Force pushed with no changes to test caching on subsequent runs. Test was successful.

[github-actions]

🎉 This PR is included in version 6.7.0 🎉

The release is available on:

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

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