build: add circleci fallback caching #15625
Merged
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Enables fallback caching within CircleCI. This means that all PRs or jobs
that caused a change in the cache key still run with the most recent and
closest maching cache. Meaning that we in theory never need to pull
Bazel repositories or
node_modules
from scratch (unless we explicitlywant to purge the cache).
Same has been applied to
angular/angular
as well.