Immer persist #395

Job	Run time
build	59s
build-spm	31s
check (Debug, gnu-6, 14)	2m 57s
docs	1m 12s
check (Debug, gnu-7, 14)	2m 58s
check (Debug, llvm-5, 14)	2m 41s
check (Debug, llvm-6, 14)	2m 48s
check (Release, gnu-6, 14)	3m 46s
check (Release, gnu-7, 14)	3m 45s
check (Release, llvm-5, 14)	4m 6s
check (Release, llvm-6, 14)	4m 11s
check (Debug, gnu-9, 14, coverage)	3m 58s
check (Debug, gnu-8, 17)	3m 3s
check (Debug, llvm-9, 17, fuzzers)	4m 10s
check (Debug, gnu-11, 20)	3m 31s
check (Debug, llvm-13, 20)	3m 16s
check (Debug, llvm-8, 14, sanitize)	4m 0s
check (Release, gnu-9, 14, benchmark)	18m 44s
check (Release, llvm-10, 14, benchmark)	19m 4s
	1h 29m 40s

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