Handle errors when signing SSH certificates #2500

Job	Run time
build on fedora:40 (gcc, true)	1m 43s
build on ubuntu:24.10 (gcc,false)	1m 21s
build on macos (macos-latest)	56s
build on fedora:40 (clang, false)	1m 41s
build on ubuntu:24.10 (clang,false)	1m 31s
build on fedora:41 (gcc, false)	1m 35s
build on macos (macos-latest-xlarge)	51s
build on ubuntu:24.04 (gcc,false)	1m 17s
build on fedora:41 (clang, false)	1m 36s
build on ubuntu:24.04 (clang,false)	1m 36s
build on ubuntu:22.04 (gcc,false)	1m 14s
build on ubuntu:22.04 (clang,true)	1m 32s
build on ubuntu:20.04 (gcc,false)	1m 33s
build on ubuntu:20.04 (clang,false)	1m 32s
build on debian:12 (gcc,false)	1m 30s
build on debian:12 (clang,false)	1m 34s
build on debian:11 (gcc,false)	1m 20s
build on debian:11 (clang,false)	1m 36s
run unit tests (ubuntu:22.04, clang)	17m 13s
run unit tests (fedora:40, gcc)	16m 31s
	59m 42s

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