Backport: Add response_types_supported to OIDC configuration (#7533) #7552
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Backport of: #7533
The OIDC Discovery standard requires the response_types_supported field
to be returned in the .well-known/openid-configuration response.
Also, the AWS IAM OIDC consumer won't accept Vault as an identity
provider without this field.
Based on examples in the OIDC Core documentation, it appears Vault
supports only the
id_token
flow, and thus that is the only value thatmakes sense to be set in this field. See:
https://openid.net/specs/openid-connect-core-1_0.html#AuthorizationExamples