features: add runtime attestation page

[fitzthum]

We've supported runtime attestation from the workload for a few releases. Let's add a feature page describing how to use it.

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[mythi]

Thanks!

[mythi]

since the example uses ASR, we could easily show how the token claims capture the events:

$ curl http://127.0.0.1:8006/aa/token\?token_type\=kbs | jq -r '.token |split(".") | .[1] | @base64d | fromjson'
...
the eventlog in AA token gets a record:

            {
              "details": {
                "data": {
                  "content": "Hello World",
                  "domain": "tdx",
                  "operation": "rtmr-extend"
                },
                "string": "tdx rtmr-extend Hello World",
                "unicode_name": "AAEL"
              },
              "digest_matches_event": true,
              "digests": [
                {
                  "alg": "SHA-384",
                  "digest": "1495be3eb2120e8c408f5f85301da8fb5cc49a50502047298b652f59facb8f3eba0ce6011a0b9ec528d02fe42447d64f"
                }
              ],
              "event": "TEVBQRsAAAB0ZHggcnRtci1leHRlbmQgSGVsbG8gV29ybGQ=",
              "index": 4,
              "type_name": "EV_EVENT_TAG"
            }

(a copy-paste I've used elsewhere and it does not match with {"domain":"test","operation":"test","content":"test"}. it also assumed jq is installed.).

[fitzthum]

Good idea. Added.