Update rust.yml

added target flag

.github/workflows/rust.yml

@@ -22,9 +22,7 @@ jobs:
       run: rustup component add rust-src
     - name: Adding bootimage
       run: cargo install bootimage
-    - name: Adding target
-      run: rustup target add target
     - name: Build
-      run: cargo build 
+      run: cargo build --target target.json
     - name: Run tests
       run: cargo test