feat: background workers (config + ensure) #4783

Job	Run time
prepare	14s
Build macOS x86_64 binaries	1h 40m 33s
Build linux/arm64 static GNU binary	24m 20s
Build linux/amd64 static GNU binary	25m 16s
Build linux/amd64 static musl binary (mimalloc)	30m 29s
Build linux/amd64 static musl binary	36m 45s
Build macOS arm64 binaries	37m 43s
Build linux/amd64 static musl binary (debug)	31m 33s
Build linux/arm64 static musl binary	35m 57s
push	-1s
	5h 22m 49s

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