Handle errors when signing SSH certificates #2325

Job	Run time
build on fedora:40 (gcc, true)	1m 42s
build on fedora:40 (clang, false)	1m 42s
build on ubuntu:24.04 (gcc,false)	1m 28s
build on fedora:39 (gcc, false)	2m 34s
build on ubuntu:24.04 (clang,false)	1m 46s
build on fedora:39 (clang, false)	1m 59s
build on ubuntu:23.10 (gcc,false)	1m 28s
build on ubuntu:23.10 (clang,false)	1m 33s
build on ubuntu:22.04 (gcc,false)	1m 27s
build on macos (macos-latest)	52s
build on ubuntu:22.04 (clang,true)	1m 32s
build on macos (macos-latest-xlarge)	45s
build on ubuntu:20.04 (gcc,false)	1m 26s
build on ubuntu:20.04 (clang,false)	1m 41s
build on debian:12 (gcc,false)	1m 23s
build on debian:12 (clang,false)	1m 32s
build on debian:11 (gcc,false)	1m 25s
build on debian:11 (clang,false)	1m 42s
run unit tests (ubuntu:22.04, clang)	11m 8s
run unit tests (fedora:40, gcc)	12m 3s
	51m 8s

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