feat: Allow using self-signed certificates in HTTPS health tests #119

Job	Run time
clippy	34s
Check MSRV and minimal-versions	53s
docker_in_docker	3m 24s
tests ($MSRV)	4m 57s
tests_with_podman (stable)	4m 8s
tests (stable)	4m 29s
tests (beta)	4m 14s
tests (nightly)	3m 48s
	26m 27s

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