pub fn bound_platform(principal: &str) -> Option<&str>Expand description
The platform a signer principal is bound to: the text after its last @
when that is <arch>-<os> over the closed sets below, else None. A
principal that names no platform (ci@relais, an email address) is
unbound, and so is one whose suffix has any other shape
(x@x86_64-linux-gnu, x@riscv64-linux).