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docs: add short explanation on attestation config options (#1654)

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Signed-off-by: Daniel Weiße <dw@edgeless.systems>
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docs/docs/architecture/attestation.md
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@ -220,6 +220,47 @@ The latter means that the value can be generated offline and compared to the one
</tabItem>
</tabs>
### CVM verification
To verify the integrity of the received attestation statement, a chain of trust from the CVM technology to the interface providing the statement has to be established.
For verification of the CVM technology, Constellation may expose additional options in its config file.
<tabs groupId="csp">
<tabItem value="azure" label="Azure SEV-SNP">
On Azure, AMD SEV-SNP is used to provide runtime encryption to the VMs.
An SEV-SNP attestation report is used to establish trust in the vTPM running inside the VM.
You may customize certain parameters for verification of the attestation statement using the Constellation config file.
* TCB versions
You can set the minimum version numbers of components in the SEV-SNP TCB.
Use the latest versions to enforce that only machines with the most recent firmware updates are allowed to join the cluster.
Alternatively, you can set a lower minimum version to allow slightly out-of-date machines to still be able to join the cluster.
* AMD Root Key Certificate
This certificate is the root of trust for verifying the SEV-SNP certificate chain.
* Firmware Signer
This config option allows you to specify how the firmware signer should be verified.
More explicitly, it controls the verification of the `IDKeyDigest` value in the SEV-SNP attestation report.
You can provide a list of accepted key digests and specify a policy on how this list is compared against the reported `IDKeyDigest`.
</tabItem>
<tabItem value="gcp" label="GCP">
There is no additional configuration available for GCP.
</tabItem>
<tabItem value="aws" label="AWS">
There is no additional configuration available for AWS.
</tabItem>
</tabs>
## Cluster attestation
Cluster-facing, Constellation's [*JoinService*](microservices.md#joinservice) verifies each node joining the cluster given the configured ground truth runtime measurements.