Also clippy check examples

.github/workflows/clippy.yml

@@ -7,6 +7,8 @@ jobs:
       RUSTFLAGS: "-D warnings"
     steps:
       - uses: actions/checkout@v2
+      - run: sudo apt-get update
+      - run: sudo apt-get install gcc-arm-none-eabi
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -17,4 +19,4 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: -- -Dwarnings
+          args: --workspace --examples -- -Dwarnings

rp2040-hal/examples/i2c.rs

@@ -44,5 +44,6 @@ fn main() -> ! {
 
     i2c.write(0x2c, &[1, 2, 3]).unwrap();
 
+    #[allow(clippy::empty_loop)]
     loop {}
 }

rp2040-hal/examples/lcd_display.rs

@@ -48,5 +48,6 @@ fn main() -> ! {
         .unwrap();
     lcd.write_str("HD44780!", &mut delay_provider).unwrap();
 
+    #[allow(clippy::empty_loop)]
     loop {}
 }