Upgrade to Yarn 3 #1671
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Upgrade to Yarn 3 #1671
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Summary
This upgrades our repository to use Yarn 3 (from v1). It keeps us with a
node-modulesinstall pattern, rather than the PnP option that Yarn has introduced. The reason for this being that thePnPmode will require more effort to migrate to. I've opened the following tickets for follow on work:https://qmacbis.atlassian.net/browse/MR-3349
https://qmacbis.atlassian.net/browse/MR-3350
This also uses some new strategies for using Yarn 3 with GitHub Actions caches, as demonstrated here. It allows for us to put things in the GHA cache during the first steps of a branch's deploy, use that cache in subsequent runs, and removes it when the PR is merged. It significantly speeds up our CI setup time after the first run.
Related issues
https://qmacbis.atlassian.net/browse/MR-2325