_ci-linux-debian.sh: re-enable osslsigncode #620

Job	Run time
linux-glibc-debian-bookworm-gcc	5m 20s
linux-glibc-debian-sid-llvm-riscv64	3m 31s
linux-glibc-debian-sid-gcc-riscv64	3m 42s
linux-glibc-debian-bookworm-llvm	5m 4s
linux-glibc-debian-testing-gcc	5m 53s
linux-glibc-debian-testing-llvm	5m 17s
linux-musl-alpine-gcc	3m 8s
linux-musl-alpine-llvm	2m 58s
linux-musl-debian-bookworm-gcc	4m 56s
linux-musl-debian-sid-gcc-riscv64	3m 16s
linux-musl-debian-bookworm-llvm	5m 17s
linux-musl-debian-sid-llvm-riscv64	3m 11s
linux-musl-debian-testing-gcc	5m 18s
linux-musl-debian-testing-llvm	5m 0s
mac-llvm	4m 30s
mac-clang	5m 11s
linux-musl-from-mac	7m 27s
reuse-check	11s
shellcheck	7s
spellcheck	4s
win-gcc	8s
win-llvm	7s
win-llvm-from-mac	7m 58s
	1h 27m 34s

Provide feedback