test: implement example pnpm workflow caching

[MikeMcC399]

• resolves issue Provide pnpm workflow caching without action enhancement #1227 for non-workspace configuration

Issue

• PR test: remove pnpm store caching #1188 removed pnpm caching due to reliability issues.
• The enhancement request Add dependency caching to pnpm #1044 remains open and at this time there is no native pnpm caching implemented in cypress-io/github-action.
• Lack of pnpm caching can cause a performance impact on workflows, negatively affecting the usability of cypress-io/github-action.

Background

pnpm Continuous Integration > GitHub Actions documentation recommends installing pnpm with pnpm/action-setup and caching pnpm with GitHub's actions/setup-node.

Change

In workflow:

• .github/workflows/example-basic-pnpm.yml

make the following changes:

• install pnpm with pnpm/action-setup
• install Node.js 20 with actions/setup-node and select pnpm. Note that cache-dependency-path: examples/basic-pnpm/pnpm-lock.yaml is necessary, since this is a monorepo and actions/setup-node does not support the use of working-directory at this time.

In the README > pnpm section, add the steps as above and refer to the pnpm Continuous Integration > GitHub Actions documentation.

Verification

Delete Actions caches

Run workflow example-basic-pnpm
Note completion time (4m 5s)

Record cache sizes

Cache	Size	Usage
node-cache-Windows-pnpm	6 MB	pnpm cache
cypress-win32-x64	170 MB	Cypress binary
pnpm-win32-x64	773 B	not relevant
node-cache-macOS-pnpm	6.1 MB	pnpm cache
cypress-darwin-arm64	140 MB	Cypress binary
pnpm-darwin-arm64	757 B	not relevant
node-cache-Linux-pnpm	6.1 MB	pnpm cache
cypress-linux-x64	170 MB	Cypress binary
pnpm-linux-x64	783 B	not relevant

Run workflow example-basic-pnpm a second time
Note completion time (2m 31s) (faster than first time)

Check caches. There should be no (significant) growth.

Job	First run	Second run
macos-14	49s	43s
ubuntu-22.04	37s	21s
windows-2022	3m 43s	2m 18s

[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]

@jennifer-shehane

This implements your suggestion to follow the pnpm documentation recommendations.

[github-actions]

🎉 This PR is included in version 6.7.3 🎉

The release is available on:

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

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