Return cert chain in json

[lukehinds]

Right now we return the cert chain back with whitespace delimiters, it should instead be a json array. I am having to write some ugly arse regex to parse this out in rust.

[haydentherapper]

The v2 API over gRPC solves this - https://github.com/sigstore/fulcio/blob/main/fulcio.proto#L195
For the v2 API over HTTP, this should also occur. We won't be making breaking changes to the v1 API.

[lukehinds]

The v2 API over gRPC solves this - https://github.com/sigstore/fulcio/blob/main/fulcio.proto#L195 For the v2 API over HTTP, this should also occur. We won't be making breaking changes to the v1 API.

cool. so I figure this is not deployed to the fulcio.sigstore.dev yet

[haydentherapper]

It has been as of Fulcio 0.4, for example curl https://fulcio.sigstore.dev/api/v2/trustBundle

Cosign is using the v2 API currently, we switched over to gRPC.

[haydentherapper]

Actually, it looks like there's a bug:

$ curl "https://fulcio.sigstore.dev/api/v2/trustBundle" | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1592  100  1592    0     0  10258      0 --:--:-- --:--:-- --:--:-- 10270
{
  "chains": [
    {
      "certificates": [
        "-----BEGIN CERTIFICATE-----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\nmygUY7Ii2zbdCdliiow=\n-----END CERTIFICATE-----\n-----BEGIN CERTIFICATE-----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\nTNMea7Ix/stJ5TfcLLeABLE4BNJOsQ4vnBHJ\n-----END CERTIFICATE-----\n"
      ]
    }
  ]
}

certificates should be multiple strings, not one concatenated. Will look at this tomorrow.