Handle errors when signing SSH certificates #2353

Job	Run time
build on fedora:40 (gcc, true)	2m 0s
build on ubuntu:24.04 (gcc,false)	1m 23s
build on fedora:40 (clang, false)	1m 28s
build on macos (macos-latest)	47s
build on fedora:39 (gcc, false)	1m 56s
build on ubuntu:24.04 (clang,false)	1m 38s
build on macos (macos-latest-xlarge)	45s
build on fedora:39 (clang, false)	1m 52s
build on ubuntu:23.10 (gcc,false)	1m 27s
build on ubuntu:23.10 (clang,false)	1m 34s
build on ubuntu:22.04 (gcc,false)	1m 20s
build on ubuntu:22.04 (clang,true)	1m 49s
build on ubuntu:20.04 (gcc,false)	1m 31s
build on ubuntu:20.04 (clang,false)	1m 30s
build on debian:12 (gcc,false)	1m 25s
build on debian:12 (clang,false)	1m 32s
build on debian:11 (gcc,false)	1m 17s
build on debian:11 (clang,false)	1m 38s
run unit tests (ubuntu:22.04, clang)	15m 10s
run unit tests (fedora:40, gcc)	11m 25s
	53m 27s

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