feat(ci): enable pnpm caching in CI

[SauravMaheshkar]

Changes made by this PR can be summarized as follows:

• Set the cache and cache-dependency-path argument to enable caching to speed up CI times.

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[balazsorban44]

Thanks, but based on #6939 this actually showed a slowdown. 🤔

[SauravMaheshkar]

Thanks, but based on #6939 this actually showed a slowdown. 🤔

Ah sorry missed the PR. Closing this

[AlexErrant]

FWIW I left a comment on that PR that described why their analysis was flawed.

[balazsorban44]

FYI, I re-added caching as I can see node_modules being installed on every run, and I'm leaning towards that #6939 (comment) is a true statement.

[balazsorban44]

With cache (restore 19s + install 24s = total 43s): https://github.com/nextauthjs/next-auth/actions/runs/5144534075/jobs/9260949734

Without cache (restore 0s + install 86s = total 86s): https://github.com/nextauthjs/next-auth/actions/runs/5144363220/jobs/9260563249

Not sure why there was 24s of install with cache, but still 2x the speed, so the cache is definitely worth it!

Duh... Thanks! 🙏