Update rust.yml

.github/workflows/rust.yml

@@ -16,6 +16,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+    - name: Install cross (cross-rs) from GitHub
+      run: cargo install cross --git https://github.com/cross-rs/cross
+    - run: cross build --package deno_runtime --target thumbv6m-none-eabi
     - run: cargo test -p deno_core
     - name: Build
       run: cargo build --verbose