Support Fulcio certificate "chains" that just have a root #40
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Summary
There were some fantastic conformance tests added with sigstore/sigstore-conformance#112.
However, one of the tests includes a mock Sigstore where Fulcio only has a root certificate and no intermediates. These changes allow that conformance test to get further (note that the conformance test won't pass with these changes, but I think that's because of an issue with the test material provided, see sigstore/sigstore-conformance#112 (comment)).
Release Note
NONE
Documentation
NA