feat: add `--cert*` options (#6) #34

Job	Run time
test-autogenerated (code-server, fedora:latest)	58s
test-autogenerated (code-server, debian:latest)	43s
test-scenarios (code-server)	4m 48s
test-global	6s
test-autogenerated (code-server, ubuntu:latest)	43s
test-autogenerated (code-server, mcr.microsoft.com/devcontainers/base:ubuntu)	42s
	8m 0s

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