Add cargo fmt --all -- --check to ci.sh

.github/workflows/rust.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: nightly
-          components: rust-src
+          components: rust-src, rustfmt
           override: true
       - name: install
         run: rustup target add thumbv7em-none-eabi thumbv6m-none-eabi

ci.sh

@@ -4,6 +4,8 @@ set -euxo pipefail
 
 cd $(dirname $0)
 
+cargo fmt --all -- --check
+
 # embassy std
 (cd embassy-std-examples; cargo build)