Handle errors when signing SSH certificates #2504

Job	Run time
build on fedora:40 (gcc, true)	1m 37s
build on macos (macos-latest)	41s
build on fedora:40 (clang, false)	1m 27s
build on macos (macos-latest-xlarge)	49s
build on ubuntu:24.10 (gcc,false)	1m 24s
build on fedora:41 (gcc, false)	1m 26s
build on fedora:41 (clang, false)	1m 30s
build on ubuntu:24.10 (clang,false)	1m 39s
build on ubuntu:24.04 (gcc,false)	1m 31s
build on ubuntu:24.04 (clang,false)	1m 41s
build on ubuntu:22.04 (gcc,false)	1m 13s
build on ubuntu:22.04 (clang,true)	1m 39s
build on ubuntu:20.04 (gcc,false)	1m 22s
build on ubuntu:20.04 (clang,false)	1m 37s
build on debian:12 (gcc,false)	1m 29s
build on debian:12 (clang,false)	1m 32s
build on debian:11 (gcc,false)	1m 18s
build on debian:11 (clang,false)	1m 34s
run unit tests (ubuntu:22.04, clang)	12m 46s
run unit tests (fedora:40, gcc)	12m 48s
	51m 3s

Provide feedback