ci: use beta, add secondary nightly ci.

examples/stm32f0/src/bin/adc.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use defmt::*;
 use embassy_executor::Spawner;

examples/stm32f0/src/bin/blinky.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use defmt::*;
 use embassy_executor::Spawner;

examples/stm32f0/src/bin/button_controlled_blink.rs

@@ -2,7 +2,6 @@
 
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use core::sync::atomic::{AtomicU32, Ordering};
 

examples/stm32f0/src/bin/button_exti.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use defmt::*;
 use embassy_executor::Spawner;

examples/stm32f0/src/bin/hello.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use defmt::info;
 use embassy_executor::Spawner;

examples/stm32f0/src/bin/multiprio.rs

@@ -55,7 +55,6 @@
 
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use cortex_m_rt::entry;
 use defmt::*;

examples/stm32f0/src/bin/wdg.rs

@@ -1,6 +1,5 @@
 #![no_std]
 #![no_main]
-#![feature(type_alias_impl_trait)]
 
 use defmt::*;
 use embassy_executor::Spawner;