Using http promotion step on endpoint which requires authentication

[aldudko]

I'd like to use the HTTP promotion step to 'freeze' promotion if the HTTP endpoint returns certain answer.
However, the HTTP endpoint I use requires authentication either via client certificates.
While the HTTP promotion step doesn't allow passing TLS configuration to the HTTP client:

kargo/internal/promotion/runner/builtin/http_requester.go

Line 239 in 0ec9926

httpTransport := cleanhttp.DefaultTransport()

Is there any workaround I could use to allow the HTTP step working with endpoints which require client certificates for authentication?