Implement worker fork #4292

Job	Run time
docker-targets-build (${{ matrix.platform.platform }})	0s
integration-tests	7m 27s
build-and-test	8m 41s
cli-tests	7m 27s
Publish binaries of ${{ matrix.project }}	0s
sharding-tests	7m 26s
wasm-rpc-stub	56s
worker-tests-group1	6m 37s
docker-publish	0s
worker-tests-group2	36s
worker-tests-group3	1s
worker-tests-group4	38s
worker-tests-group5	1s
worker-tests-group6	1s
worker-tests-group7	1s
worker-tests-group8	1s
publish	1s
publish-slack-notification	1s
	39m 55s

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