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bugfix: Add yarn.lock to avoid flaky website building #1517

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Run time

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Job	Run time
jsdom	2m 0s
jvm (11)	1m 36s
Scalafix and Docs	2m 5s
jvm (8)	1m 20s
js	1m 47s
mima	50s
native	2m 2s
scalafmt	15s
windows	3m 2s
	14m 57s