i#7284: musl: Bootstrap Alpine from minirootfs in workflow #26

Job	Run time
x86-32	13m 14s
x86-32-ubuntu22	3m 30s
x86-64	13m 12s
x86-64-alpine-3_21	16s
x86-64-ubuntu22	4m 52s
send-failure-notification / send-failure-notification-job	0s
	35m 4s

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