jammy-amd64-tf-a-build: Support Nightly Rust

Also install the Rust nightly toolchain to allow testing of unstable
features like BTI and PAC.

Change-Id: Ic5d368806821e94dc3dc9d36de9be31974fd73da
Signed-off-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
1 file changed