Handle errors when signing SSH certificates #2502

Job	Run time
build on fedora:40 (gcc, true)	1m 5s
build on fedora:40 (clang, false)	1m 24s
build on ubuntu:24.10 (gcc,false)	47s
build on ubuntu:24.10 (clang,false)	59s
build on ubuntu:24.04 (gcc,false)	1m 0s
build on fedora:41 (gcc, false)	1m 3s
build on ubuntu:24.04 (clang,false)	1m 8s
build on fedora:41 (clang, false)	1m 16s
build on ubuntu:22.04 (gcc,false)	51s
build on ubuntu:22.04 (clang,true)	1m 2s
build on ubuntu:20.04 (gcc,false)	53s
build on macos (macos-latest)	41s
build on ubuntu:20.04 (clang,false)	1m 2s
build on debian:12 (gcc,false)	56s
build on macos (macos-latest-xlarge)	34s
build on debian:12 (clang,false)	1m 9s
build on debian:11 (gcc,false)	54s
build on debian:11 (clang,false)	1m 6s
run unit tests	0s
	17m 50s

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