feat: add `--cert*` options #32

Job	Run time
test-scenarios (code-server)	4m 20s
test-global	5s
test-autogenerated (code-server, fedora:latest)	54s
test-autogenerated (code-server, debian:latest)	38s
test-autogenerated (code-server, ubuntu:latest)	34s
test-autogenerated (code-server, mcr.microsoft.com/devcontainers/base:ubuntu)	52s
	7m 23s

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