cross-compile now in CI

.github/workflows/ci.yml

@@ -12,10 +12,13 @@ jobs:
         with:
           profile: minimal
           toolchain: stable
+          target: thumbv6m-none-eabi
           override: true
       - uses: actions-rs/cargo@v1
         with:
+          use-cross: true
           command: check
+          args: --target thumbv6m-none-eabi
 
   fmt:
     name: Rustfmt
@@ -42,12 +45,14 @@ jobs:
         with:
           profile: minimal
           toolchain: stable
+          target: thumbv6m-none-eabi
           override: true
       - run: rustup component add clippy
       - uses: actions-rs/cargo@v1
         with:
+          use-cross: true
           command: clippy
-          args: -- -D warnings
+          args: --target thumbv6m-none-eabi -- -D warnings
 
   ci:
       if: ${{ success() }}