Add the SHA256 of the hook payload to the JWS token.
Add the SHA256 of the hook payload to the JWS token.

So the hook receiver can validate its integrity.

Signed-off-by: David Calavera <b9b0c8e7f90ecf337f6797c4d2e0f1dd0dbc0324@gmail.com>

netlify/gotrue,netlify/gotrue