Update boringtun.yml

.github/workflows/boringtun.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   BoringTun:
-    name: Rust project
+    name: Cross compile BoringTun
     runs-on: ubuntu-latest
     steps:
       - name: Check code
@@ -17,7 +17,10 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
+          target: aarch64-unknown-linux-gnu
+          override: true
       - uses: actions-rs/cargo@v1
         with:
+          use-cross: true
           command: build
           args: --release --bin boringtun-cli --all-features