gateway: add HMAC request signature authentication - #4652
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Adds an optional auth.hmac config block to the gateway input that authenticates incoming requests by verifying a hex-encoded HMAC signature (SHA-256 or SHA-512) of the raw request body against a shared secret, read from a configurable request header. When set it replaces the platform-managed JWT/RBAC authentication for the endpoint, supporting webhook-style callers that sign their payloads instead of presenting a bearer token (e.g. Terraform Cloud Run Tasks). The auth block is designed as an extension point for additional authentication mechanisms in the future.
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Adds an optional auth.hmac config block to the gateway input that authenticates incoming requests by verifying a hex-encoded HMAC signature (SHA-256 or SHA-512) of the raw request body against a shared secret, read from a configurable request header. When set it replaces the platform-managed JWT/RBAC authentication for the endpoint, supporting webhook-style callers that sign their payloads instead of presenting a bearer token (e.g. Terraform Cloud Run Tasks).
The auth block is designed as an extension point for additional authentication mechanisms in the future.
jira: DEVPROD-4607