Save yarn locally to workaround setup-node issue #47
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Setup-node refuses to add an option for enabling corepack due to it being marked experimental. This unwittingly resulted in us using the globally installed yarn v1 version for building on GitHub Actions, despite our expectation that yarn v4 would be used. Rather than do a dance of enabling corepack and setting up node, this saves yarn locally and checks it into git.
Also bumps yarn from 4.0.1 to 4.0.2.
See actions/setup-node#899 which we started seeing, for example https://github.com/JapanFinance/JapanFinance.github.io/actions/runs/6909375623/job/18800585931?pr=46. It doesn't happen on every build, as a rebuild passed.
This situation could have been avoided if setup-node had an option to enable
corepack
; see actions/setup-node#531.